diff --git a/docs/iron-coast.md b/docs/iron-coast.md
new file mode 100644
index 00000000..835958f0
--- /dev/null
+++ b/docs/iron-coast.md
@@ -0,0 +1,107 @@
+# Iron Coast content packages
+
+Iron Coast is a local campaign assembled from seven independently toggleable
+mods. Enable all six dependencies before enabling the campaign package. The
+Mods manager validates versions and dependency order and applies the change
+at the main menu. The new weapons can also be used in the original campaigns;
+the enemy packages can be referenced from other missions.
+
+| Package | Content |
+| --- | --- |
+| `iron_coast_mission_1` | Breakwater mission, campaign, supply depots, field repairs, terrain, briefing art and mission audio |
+| `iron_coast_scout` | Airborne scout, weaving AI, projectiles, art and audio |
+| `iron_coast_turret` | Ground turret, aimed firing, projectiles, art and audio |
+| `iron_coast_boss` | Harbor command ship, persistent patrol and fan volleys, art and audio |
+| `pulse_cannon` | Primary paired pulses and scripted burst rounds |
+| `seeker_swarm` | Selectable homing missile volleys |
+| `ion_lance` | Selectable penetrating beam |
+
+All packages are version 1.0.0 and use mod API 1. Mission 1 requires compatible
+1.x versions of the other six. Save compatibility also records each enabled
+package's exact version and content hash.
+
+## Mission 1: Breakwater
+
+The player raids a coastal industrial harbor. Ten scouts cover the approach,
+four ground turrets protect the docks, two destructible supply depots release
+repair kits, and the command ship arrives at step 720. Destroy at least two
+turrets and the command ship to finish. The boss stays in the playfield until
+killed; waiting out the mission duration cannot produce victory.
+
+The mission grants a trial Pulse Cannon, which fires alongside forward guns,
+and three field repairs. Cycle equipment to **Iron Coast Field Repair** and
+press the special button to restore 25 shield per repair. Depots drop extra
+repairs. Victory pays 5,000 credits plus ordinary enemy rewards. The central
+turrets and boss patrol overlap the starter-gun firing corridor; the mission
+is intended to remain playable without the trial weapon.
+
+Script objectives are namespaced and saved with the pilot:
+
+| Objective | Meaning |
+| --- | --- |
+| `iron_coast_mission_1:phase` | 1 approach, 2 docks, 3 command ship, 4 complete |
+| `iron_coast_mission_1:turrets_required` | Required count of two |
+| `iron_coast_turret:defeated` | Turrets destroyed |
+| `iron_coast_boss:defeated` | Command ships destroyed |
+| `iron_coast_mission_1:depots_opened` | Supply depots destroyed |
+| `iron_coast_mission_1:complete` | All required targets destroyed |
+
+## Art and audio
+
+Original terrain asset `0x10360` and military sprite `0x102f6` were decoded and
+inspected before generating the new art with the built-in imagegen skill.
+Every package includes generated masters, packaged SD/HD art, WAV files and
+prompt/provenance metadata in Git. Original style-reference images and original
+game data remain outside Git. Mission sources are a generated shoreline texture,
+harbor briefing backdrop and transparent supply depot. The source images
+remain unchanged; the build step normalizes logical footprints and derives
+palette SD versions and HD counterparts.
+
+Mission tiles have 32×32 logical canvases, 32×32 palette SD images and 128×128
+HD images. The 288×384 logical shoreline map is converted globally before
+cropping into 108 tiles. A reflected copy produces 216 definitions; twelve
+forward rows followed by twelve reflected rows give exact matching pixels
+at each vertical repetition boundary. This keeps the map continuous but
+repeats and reflects port structures. The 72-row mission map uses three such
+periods. This is a deliberate first-mission content choice, not unique terrain
+for the whole original game.
+
+Briefing/menu art uses a 320×200 logical canvas, with 320×200 SD and 1280×800
+HD files. Supply depots preserve a 32×32 collision canvas and transparent
+sprite margins; repair icons use 16×16 logical canvases. The asset report
+records hashes, palette membership, footprints and repeat-boundary checks.
+HD remains constrained by the renderer's indexed palette, so generated color
+detail is reduced to the selected palette during play.
+
+Mission audio is original procedural synthesis: approach signal, dock alarm,
+boss warning, victory arpeggio, depot impact and repair cue. These are bounded
+mono PCM16 WAVs at 22,050 Hz, 0.35–1.2 seconds, made from deterministic
+oscillators and seeded noise. No original sound recording, SoundFont or online
+audio service is used. The generator and output hashes are tracked.
+
+The generated mod assets are included in Git, so a fresh checkout includes
+the complete seven packages. The original base-game asset catalog is still
+required locally to play the game and remains excluded from version control.
+To rebuild the mission assets from their included generated masters, run:
+
+```sh
+python3 examples/mods/iron_coast_mission_1/build_assets.py --palette data/misc/PALETTE_DAT
+cargo run --no-default-features -- --mods examples/mods --validate-mods iron_coast_scout,iron_coast_turret,iron_coast_boss,pulse_cannon,seeker_swarm,ion_lance,iron_coast_mission_1
+```
+
+## Acceptance checks
+
+`tests/iron_coast.rs` loads all seven real manifests, definitions and scripts
+with synthetic PNG/WAV fixtures. It checks dependency activation, artwork
+footprints, explicit boss/turret completion gating, one-time victory rewards,
+and actual headless runs through the scout waves and boss using starter guns
+and the trial Pulse Cannon. These tests use no original images and replace the
+generated assets with synthetic fixtures. Local package validation additionally checks
+the actual generated SD/HD images and WAV files.
+
+Visual approval remains provisional: sprite and terrain previews were
+inspected for readability, canvas alignment and transparency, with numeric
+palette and repeat-seam checks. Wider player testing should assess difficulty,
+audio balance and HD details during normal play before treating the new art
+as final. These packages extend the Rust engine; they do not establish full
+parity across the original campaigns.
diff --git a/examples/mods/ion_lance/ART_PROVENANCE.md b/examples/mods/ion_lance/ART_PROVENANCE.md
new file mode 100644
index 00000000..dd5ba04a
--- /dev/null
+++ b/examples/mods/ion_lance/ART_PROVENANCE.md
@@ -0,0 +1,7 @@
+# ion_lance artwork provenance
+
+Generated locally with the built-in image generation tool and the imagegen skill. Original catalog IDs `0x102b1` (gray gun inventory icon) and `0x101cf` (8×8 projectile) were decoded and inspected as style/scale references. Original pixels are not included in the mod or Git. The prompt uses these references to create a distinct naval industrial weapon rather than copy the original.
+
+Generated master images, SD/HD sprites and sound WAVs are tracked with the package, as requested. Original game pixels and decoded reference images remain outside Git. The generated source is converted into 16×16/64×64 equipment canvases and a 4×32 logical projectile canvas plus its 4× HD counterpart. Transparent margins remain inside the logical canvas. Sound synthesis is deterministic, PCM16 mono 22,050 Hz; `generate_audio.py` is the complete reproduction source.
+
+Prompts and generated-source SHA256 hashes are recorded in `art-provenance.json` after output verification. Palette conversion occurs in the runtime loader; gameplay dimensions do not depend on HD artwork.
diff --git a/examples/mods/ion_lance/README.md b/examples/mods/ion_lance/README.md
new file mode 100644
index 00000000..f08f7fe3
--- /dev/null
+++ b/examples/mods/ion_lance/README.md
@@ -0,0 +1,9 @@
+# Ion Lance 1.0.0
+
+Enable **Ion Lance** in Mods and apply at the main menu. This independent API 1 example has no dependencies. Buy its equipment in the shop (22,000 credits, maximum one) or collect its pickup. Choose it in Inventory or cycle special weapons during a mission. The equipped weapon fires with Fire or Special; it consumes no ammunition.
+
+Projectile: 8 damage, 12 logical pixels per step, 14 step cooldown, `beam`, air and ground targets. The narrow beam pierces every enemy in its column for two steps (16 total damage per enemy per trigger). Rhai stores bounded burst/hit counters and emits local firing/impact sounds and effects.
+
+`art/equipment-sd.png` is a 16×16 logical icon, `art/equipment-hd.png` its detailed 4× variant. Projectile canvases are 4×32 SD and 16×128 HD. Switch HD artwork in Options. The generated master images, SD/HD sprites, WAV files, provenance and reproduction inputs are tracked in Git. Original game assets and decoded reference images remain outside version control. `python3 generate_audio.py` reproduces both sound files.
+
+Validate locally with `cargo run --no-default-features -- --mods examples/mods --validate-mods ion_lance`. Read the shared [API documentation](../../../docs/modding-api.md) for save pins, dependencies and sandbox limits.
diff --git a/examples/mods/ion_lance/art-provenance.json b/examples/mods/ion_lance/art-provenance.json
new file mode 100644
index 00000000..e53d536f
--- /dev/null
+++ b/examples/mods/ion_lance/art-provenance.json
@@ -0,0 +1,65 @@
+{
+  "package": "ion_lance",
+  "tool": "built-in image_gen",
+  "skill": "/home/quintine/.codex/skills/.system/imagegen/SKILL.md",
+  "reference_role": "Original catalog sprites inspected as style and scale references, not copied as mod artwork",
+  "reference_assets": [
+    "0x102b1",
+    "0x101cf"
+  ],
+  "sources": [
+    {
+      "kind": "equipment",
+      "path": "/home/quintine/.codex/generated_images/01a12340-dd1f-71e1-869a-0c9f61a82318/exec-2c5afac0-cc57-42f9-a0ca-f01125ba186a.png",
+      "prompt": "Use case: stylized-concept. Asset type: HD sprite for equipment shop/inventory in 1990s military science-fiction vertical shooter. Input image is an ORIGINAL STYLE REFERENCE ONLY, not an edit target. Generate a distinct Ion Lance: compact single long railgun barrel pointing exactly UP from an armored gray rectangular gun pod, two subtle electric-blue induction rails, red service panel. Top-down orthographic overhead view, precise thin symmetrical military silhouette. Isolated single object centered on genuinely transparent 1024x1024 square canvas, silhouette central 70% with12% transparentmargin. Match reference muted gunmetal, chunky readability, upper-left highlight. Restrained panel/machined detail forHD. No text, labels, outside glow/shadows, frame, border, extraobjects. Displaylogical16x16SDand64x64HD, so silhouette must survive reduction.",
+      "sha256": "145215af5159eb196fc18c8c4f9f0e1c318ff552b9a83e4d8fc0d354309da4f5",
+      "local_path": "art/equipment-generated-source.png"
+    },
+    {
+      "kind": "projectile",
+      "path": "/home/quintine/.codex/generated_images/01a12340-dd1f-71e1-869a-0c9f61a82318/exec-da141e14-efd2-4a36-a56f-bbc33225674f.png",
+      "prompt": "Use case: stylized-concept. Asset type: ONE isolated ion beam pulse projectile sprite for a military science-fiction vertical shooter. Original input is STYLE reference only for readable chunky projectile palette. Generate a straight very narrow vertical electric blue/white ion lance beam traveling exactly UP: continuous thin pale core, bounded cobalt/cyan stepped edges, brightest pointed upper tip, slightly tapered bottom tail. No gun, no spacecraft, no extraneous light halo. Orthographic view, perfectly straight, centered, width:height1:8. Genuine transparent square canvas with generous sides and15%transparent top/bottom margin. Pixel-inspired military science-fiction HD detail, minimal colors, reference's crispbounded silhouette. No text, labels, shadows, frame, multiple objects. Intendedlogicalcanvas4x32 and16x128HD.",
+      "sha256": "1a1c19b40354554658a4b72073ed7a7aec9a2bfb185c20d9654a29e2eef75614",
+      "local_path": "art/projectile-generated-source.png"
+    }
+  ],
+  "conversion": "prepare_art.rs crops to alpha>=128 silhouette, fits with transparent margins, preserves aspect and reduces to logical SD/4xHD. SD nearest sampling alpha128; HD Lanczos3 alpha64. Pixel values quantized at runtime.",
+  "outputs": {
+    "art/equipment-generated-source.png": {
+      "sha256": "145215af5159eb196fc18c8c4f9f0e1c318ff552b9a83e4d8fc0d354309da4f5",
+      "bytes": 324909
+    },
+    "art/equipment-sd.png": {
+      "sha256": "bb366d1604bd54079cb5e4c23f7e14aa9da1c9f494e66be1f9f3b870e0adec40",
+      "bytes": 338
+    },
+    "art/equipment-hd.png": {
+      "sha256": "66aa9a088453059518d4f76d961518edc577729018262d270bc6c3d806f665e4",
+      "bytes": 2451
+    },
+    "art/projectile-generated-source.png": {
+      "sha256": "1a1c19b40354554658a4b72073ed7a7aec9a2bfb185c20d9654a29e2eef75614",
+      "bytes": 162173
+    },
+    "art/projectile-sd.png": {
+      "sha256": "d8d2376739d39c343e9afc242b48956fcc8e48bc09fbc626360f8b3c4a52b730",
+      "bytes": 308
+    },
+    "art/projectile-hd.png": {
+      "sha256": "671cae899e2c5c9fd180663255915faaefe14267ddc46bd33ccd04dc51ba0dd4",
+      "bytes": 1688
+    }
+  },
+  "sounds": {
+    "audio/fire.wav": {
+      "sha256": "c155d02643f92f4e06373987d97728052617fca36d8ee9e712199078e89480a6",
+      "bytes": 5776,
+      "synthesis": "generate_audio.py PCM16 mono22050Hz"
+    },
+    "audio/impact.wav": {
+      "sha256": "19b9be1a9fc960faa616a497535f5489c8d3021fc60f324aca9489c1be4a5ab6",
+      "bytes": 7540,
+      "synthesis": "generate_audio.py PCM16 mono22050Hz"
+    }
+  }
+}
diff --git a/examples/mods/ion_lance/art/equipment-generated-source.png b/examples/mods/ion_lance/art/equipment-generated-source.png
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new file mode 100644
index 00000000..e3935ac9
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diff --git a/examples/mods/ion_lance/art/projectile-sd.png b/examples/mods/ion_lance/art/projectile-sd.png
new file mode 100644
index 00000000..870da198
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diff --git a/examples/mods/ion_lance/audio/fire.wav b/examples/mods/ion_lance/audio/fire.wav
new file mode 100644
index 00000000..7bb6a097
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diff --git a/examples/mods/ion_lance/audio/impact.wav b/examples/mods/ion_lance/audio/impact.wav
new file mode 100644
index 00000000..d711a23f
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diff --git a/examples/mods/ion_lance/content.json b/examples/mods/ion_lance/content.json
new file mode 100644
index 00000000..ed13887c
--- /dev/null
+++ b/examples/mods/ion_lance/content.json
@@ -0,0 +1,67 @@
+{
+  "weapons": [
+    {
+      "id": "ion_lance:projectile",
+      "name": "Ion Lance Projectile",
+      "damage": 8,
+      "speed": 12,
+      "cooldown": 14,
+      "behavior": "beam",
+      "target": "all",
+      "offsets": [
+        [
+          0,
+          -4
+        ]
+      ],
+      "art": {
+        "png": "art/projectile-sd.png",
+        "hd_png": "art/projectile-hd.png",
+        "logical_width": 4,
+        "logical_height": 32,
+        "nearest": true
+      },
+      "script": "scripts/weapon.rhai"
+    }
+  ],
+  "items": [
+    {
+      "id": "ion_lance:equipment",
+      "name": "Ion Lance",
+      "price": 22000,
+      "max_count": 1,
+      "initial_count": 1,
+      "weapon": "ion_lance:projectile",
+      "special": true,
+      "consumable": false,
+      "art": {
+        "png": "art/equipment-sd.png",
+        "hd_png": "art/equipment-hd.png",
+        "logical_width": 16,
+        "logical_height": 16,
+        "nearest": true
+      },
+      "script": "scripts/equipment.rhai"
+    }
+  ],
+  "sounds": [
+    {
+      "id": "ion_lance:fire",
+      "name": "Ion Lance Fire",
+      "file": "audio/fire.wav",
+      "volume": 92,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 1
+    },
+    {
+      "id": "ion_lance:impact",
+      "name": "Ion Lance Impact",
+      "file": "audio/impact.wav",
+      "volume": 78,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    }
+  ]
+}
diff --git a/examples/mods/ion_lance/generate_audio.py b/examples/mods/ion_lance/generate_audio.py
new file mode 100644
index 00000000..1a1d0411
--- /dev/null
+++ b/examples/mods/ion_lance/generate_audio.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+"""Reproduce local procedural weapon audio; WAV outputs are tracked with the package."""
+import math
+import struct
+import wave
+from pathlib import Path
+
+PACKAGE = "ion_lance"
+RATE = 22050
+
+def render(kind):
+    duration = 0.13 if kind == "fire" else 0.17
+    count = int(RATE * duration)
+    phase = 0.0
+    seed = 0xA7C51D3
+    samples = []
+    for n in range(count):
+        t = n / count
+        seed ^= (seed << 13) & 0xffffffff
+        seed ^= seed >> 17
+        seed ^= (seed << 5) & 0xffffffff
+        seed &= 0xffffffff
+        noise = (seed / 2147483648.0) - 1.0
+        if PACKAGE == "pulse_cannon":
+            frequency = (1350 * (1 - t) + 190) if kind == "fire" else 130
+            tone = math.sin(phase) * 0.64 + noise * 0.22
+        elif PACKAGE == "seeker_swarm":
+            frequency = 330 + 850 * t if kind == "fire" else 95
+            tone = noise * 0.48 + math.sin(phase) * 0.35
+        else:
+            frequency = 1850 + 680 * t if kind == "fire" else 680 * (1 - t) + 110
+            tone = math.sin(phase) * 0.52 + math.sin(phase * 1.997) * 0.2 + noise * 0.06
+        phase += 2 * math.pi * frequency / RATE
+        attack = min(1.0, n / (RATE * 0.003))
+        envelope = attack * (1 - t) ** (3 if kind == "impact" else 2)
+        samples.append(round(max(-1, min(1, tone * envelope)) * 21000))
+    return struct.pack("<" + "h" * len(samples), *samples)
+
+if __name__ == "__main__":
+    output = Path(__file__).resolve().parent / "audio"
+    output.mkdir(exist_ok=True)
+    for kind in ["fire", "impact"]:
+        with wave.open(str(output / (kind + ".wav")), "wb") as wav:
+            wav.setparams((1, 2, RATE, 0, "NONE", "not compressed"))
+            wav.writeframes(render(kind))
+        print(output / (kind + ".wav"))
diff --git a/examples/mods/ion_lance/mod.toml b/examples/mods/ion_lance/mod.toml
new file mode 100644
index 00000000..ca56f1f7
--- /dev/null
+++ b/examples/mods/ion_lance/mod.toml
@@ -0,0 +1,7 @@
+id = "ion_lance"
+name = "Ion Lance"
+version = "1.0.0"
+api_version = 1
+description = "Naval science-fiction ion lance: independent weapon, equipment, SD/HD artwork and local firing/impact audio."
+content = "content.json"
+scripts = ["scripts/weapon.rhai", "scripts/equipment.rhai"]
diff --git a/examples/mods/ion_lance/prepare_art.rs b/examples/mods/ion_lance/prepare_art.rs
new file mode 100644
index 00000000..853fc71b
--- /dev/null
+++ b/examples/mods/ion_lance/prepare_art.rs
@@ -0,0 +1,90 @@
+//! Build game-ready logical and HD PNG canvases from the inspected generated sources.
+//! Compile with the project's image dependency, then pass equipment source, shot source.
+use image::{Rgba, RgbaImage, imageops};
+use std::{env, fs, path::Path};
+const PACKAGE: &str = "ion_lance";
+const SHOT: (u32, u32) = (4, 32);
+fn canvas(source: &RgbaImage, width: u32, height: u32, hd: bool) -> RgbaImage {
+    // Only the solid silhouette defines its fitting box; faint outer glows stay bounded.
+    let mut bounds = (source.width(), source.height(), 0, 0);
+    for (x, y, p) in source.enumerate_pixels() {
+        if p[3] >= 128 {
+            bounds.0 = bounds.0.min(x);
+            bounds.1 = bounds.1.min(y);
+            bounds.2 = bounds.2.max(x + 1);
+            bounds.3 = bounds.3.max(y + 1);
+        }
+    }
+    assert!(
+        bounds.2 > bounds.0 && bounds.3 > bounds.1,
+        "source has no opaque silhouette"
+    );
+    let cropped = imageops::crop_imm(
+        source,
+        bounds.0,
+        bounds.1,
+        bounds.2 - bounds.0,
+        bounds.3 - bounds.1,
+    )
+    .to_image();
+    let margin = if hd { 4 } else { 1 };
+    let available = (
+        width.saturating_sub(margin * 2).max(1),
+        height.saturating_sub(margin * 2).max(1),
+    );
+    let factor = (available.0 as f64 / cropped.width() as f64)
+        .min(available.1 as f64 / cropped.height() as f64);
+    let size = (
+        (cropped.width() as f64 * factor).round().max(1.) as u32,
+        (cropped.height() as f64 * factor).round().max(1.) as u32,
+    );
+    let filter = if hd {
+        imageops::FilterType::Lanczos3
+    } else {
+        imageops::FilterType::Nearest
+    };
+    let mut scaled = imageops::resize(&cropped, size.0, size.1, filter);
+    for p in scaled.pixels_mut() {
+        if p[3] < (if hd { 64 } else { 128 }) {
+            *p = Rgba([0, 0, 0, 0]);
+        } else {
+            p[3] = 255;
+        }
+    }
+    let mut out = RgbaImage::new(width, height);
+    imageops::overlay(
+        &mut out,
+        &scaled,
+        ((width - size.0) / 2) as i64,
+        ((height - size.1) / 2) as i64,
+    );
+    out
+}
+fn main() {
+    let args: Vec<_> = env::args_os().collect();
+    assert_eq!(
+        args.len(),
+        4,
+        "usage: prepare_art EQUIPMENT_SOURCE SHOT_SOURCE PACKAGE_DIRECTORY"
+    );
+    let output = Path::new(&args[3]).join("art");
+    fs::create_dir_all(&output).unwrap();
+    for (kind, path, logical) in [
+        ("equipment", &args[1], (16, 16)),
+        ("projectile", &args[2], SHOT),
+    ] {
+        let source = image::open(path).unwrap().into_rgba8();
+        fs::copy(path, output.join(format!("{kind}-generated-source.png"))).unwrap();
+        for (mode, scale) in [("sd", 1), ("hd", 4)] {
+            let image = canvas(&source, logical.0 * scale, logical.1 * scale, scale == 4);
+            let path = output.join(format!("{kind}-{mode}.png"));
+            image.save(&path).unwrap();
+            println!(
+                "{PACKAGE}: {}×{} {}",
+                image.width(),
+                image.height(),
+                path.display()
+            );
+        }
+    }
+}
diff --git a/examples/mods/ion_lance/scripts/equipment.rhai b/examples/mods/ion_lance/scripts/equipment.rhai
new file mode 100644
index 00000000..a149c4d4
--- /dev/null
+++ b/examples/mods/ion_lance/scripts/equipment.rhai
@@ -0,0 +1,6 @@
+// Recovery is recorded separately from the weapon firing state.
+fn on_pickup(event, state, random) {
+    let recovered = if state.contains("recovered") { state.recovered % 100000 + 1 } else { 1 };
+    #{ commands: [#{ op: "objective", key: "ion_lance:recovered", value: recovered }],
+       state: #{ recovered: recovered } }
+}
diff --git a/examples/mods/ion_lance/scripts/weapon.rhai b/examples/mods/ion_lance/scripts/weapon.rhai
new file mode 100644
index 00000000..4a1edd61
--- /dev/null
+++ b/examples/mods/ion_lance/scripts/weapon.rhai
@@ -0,0 +1,21 @@
+// Built-in beam projectiles handle the normal volley and collision rules.
+// Callbacks add deterministic visuals, audio and serializable weapon counters.
+fn on_fire(event, state, random) {
+    let bursts = if state.contains("bursts") { state.bursts % 100000 + 1 } else { 1 };
+    let hits = if state.contains("hits") { state.hits } else { 0 };
+    let commands = [
+        #{ op: "play_sound", sound: "ion_lance:fire" },
+#{ op: "effect", x: event.x, y: event.y - 3 }
+    ];
+    #{ commands: commands, state: #{ bursts: bursts, hits: hits } }
+}
+
+fn on_hit(event, state, random) {
+    let bursts = if state.contains("bursts") { state.bursts } else { 0 };
+    let hits = if state.contains("hits") { state.hits % 100000 + 1 } else { 1 };
+    let commands = [
+        #{ op: "play_sound", sound: "ion_lance:impact" },
+        #{ op: "effect", x: event.x, y: event.y }
+    ];
+    #{ commands: commands, state: #{ bursts: bursts, hits: hits } }
+}
diff --git a/examples/mods/iron_coast_boss/README.md b/examples/mods/iron_coast_boss/README.md
new file mode 100644
index 00000000..abb46ed1
--- /dev/null
+++ b/examples/mods/iron_coast_boss/README.md
@@ -0,0 +1,17 @@
+# Iron Coast Command Cruiser
+
+Independent version 1.0.0 enemy package for mod API 1. Enable/disable it from the in-game Mods screen and use it in any mission through `iron_coast_boss:unit`. Iron Coast mission 1 supplies placements and completion objectives; this package does not add a mission or override base content.
+
+Airborne command cruiser enters at 2 pixels/tick, settles at y24 and patrols x80..144 indefinitely. It fires a fan of three 3 damage shells every 54 ticks. A standard pilot can destroy it with starter guns; it stays in their firing corridor.
+
+Logical collision canvas `96×64`, top-left anchor `(0,0)`, health `160`, reward `1800` credits, firing interval `54` simulation ticks. The engine halves boss health on difficulties 0/1; difficulty 2/3 uses the declared health. SD mode uses `art/unit-sd.png`; enable HD art in Settings for `art/unit-hd.png`. The HD canvas is 8× logical resolution and bypasses automatic ScaleNx. Projectile artwork has an 8×8 logical canvas and an independent 64×64 HD version.
+
+The boss uses two registered frames (idle/amber charged); the scout and turret use stable single frames. All supplied variants stay on the same canvas and anchor. `art-qa.json` records transparency bounds and, for the boss, animation silhouette overlap.
+
+Enemy deaths increment the current mission objective `iron_coast_boss:defeated`. Persistent script `destroyed`, `hits` and `shots` counters are statistics; current-mission objectives reset when the mission restarts. Callbacks guard retired entities and use deterministic simulation data. No wall clock or unseeded random input enters the scripts.
+
+Generated PNG masters, SD/HD strips, previews and WAV sounds are included in Git. Original reference images under `art/source/` are excluded. Exact built-in imagegen prompts are in `prompts/`, with source IDs and generated-image provenance in `provenance.json`.
+
+To rebuild derived artwork from supplied generated masters and regenerate audio, install Pillow and run `python3 build_assets.py`. To regenerate only audio with the Python standard library, run `python3 build_assets.py --audio-only`. WAVs are original procedural mono 16-bit PCM at 22050 Hz; `audio-recipe.json` records deterministic seeds, sizes and hashes. The art pipeline resizes and assembles supplied images; it does not redraw them.
+
+Validate from the repository root: `cargo run -- --mods examples/mods --validate-mods iron_coast_boss`. Synthetic behavior and save/replay tests: `cargo test --test enemies_mods`. Verify shipped artwork locally: `cargo test --test enemies_mods shipped_enemy_assets_are_valid_and_aligned`.
diff --git a/examples/mods/iron_coast_boss/art-qa.json b/examples/mods/iron_coast_boss/art-qa.json
new file mode 100644
index 00000000..596541c4
--- /dev/null
+++ b/examples/mods/iron_coast_boss/art-qa.json
@@ -0,0 +1,41 @@
+{
+  "logical_size": [
+    96,
+    64
+  ],
+  "hd_scale": 8,
+  "origin": [
+    0,
+    0
+  ],
+  "frames": 2,
+  "frame_order": [
+    "idle",
+    "charged"
+  ],
+  "alpha": "Preserved RGBA; runtime uses alpha>=128 indexed transparency",
+  "registration": "Common full-canvas resize and equal padding for every frame",
+  "sources": [
+    {
+      "source": "art/unit-generated-v1.png",
+      "source_sha256": "87d644a5d584ad82e285241e3a5cdc58e5c61fa851415a4d6660e0ae83ec5e85",
+      "sd_opaque_bounds": [
+        25,
+        3,
+        71,
+        61
+      ]
+    },
+    {
+      "source": "art/unit-charge-generated-v1.png",
+      "source_sha256": "cc8401140982260b4675a0a28fd209b8ed8d636e4cd4fa98a9cdf2fed37b1bff",
+      "sd_opaque_bounds": [
+        25,
+        3,
+        71,
+        61
+      ]
+    }
+  ],
+  "animation_silhouette_overlap": 0.9985000050675504
+}
diff --git a/examples/mods/iron_coast_boss/art/preview.png b/examples/mods/iron_coast_boss/art/preview.png
new file mode 100644
index 00000000..1555720b
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diff --git a/examples/mods/iron_coast_boss/art/projectile-generated-v1.png b/examples/mods/iron_coast_boss/art/projectile-generated-v1.png
new file mode 100644
index 00000000..b1d1da06
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diff --git a/examples/mods/iron_coast_boss/art/projectile-hd.png b/examples/mods/iron_coast_boss/art/projectile-hd.png
new file mode 100644
index 00000000..07fc070a
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diff --git a/examples/mods/iron_coast_boss/art/projectile-sd.png b/examples/mods/iron_coast_boss/art/projectile-sd.png
new file mode 100644
index 00000000..f3231717
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diff --git a/examples/mods/iron_coast_boss/art/unit-charge-generated-v1.png b/examples/mods/iron_coast_boss/art/unit-charge-generated-v1.png
new file mode 100644
index 00000000..061d18dd
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diff --git a/examples/mods/iron_coast_boss/art/unit-generated-v1.png b/examples/mods/iron_coast_boss/art/unit-generated-v1.png
new file mode 100644
index 00000000..84b1ffb6
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diff --git a/examples/mods/iron_coast_boss/art/unit-hd.png b/examples/mods/iron_coast_boss/art/unit-hd.png
new file mode 100644
index 00000000..8234b63b
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diff --git a/examples/mods/iron_coast_boss/art/unit-sd.png b/examples/mods/iron_coast_boss/art/unit-sd.png
new file mode 100644
index 00000000..c09a3d0b
Binary files /dev/null and b/examples/mods/iron_coast_boss/art/unit-sd.png differ
diff --git a/examples/mods/iron_coast_boss/audio-recipe.json b/examples/mods/iron_coast_boss/audio-recipe.json
new file mode 100644
index 00000000..b2a57d16
--- /dev/null
+++ b/examples/mods/iron_coast_boss/audio-recipe.json
@@ -0,0 +1,23 @@
+{
+  "generator": "build_assets.py deterministic chirp/noise synthesis; no recordings",
+  "kind": "boss",
+  "seed": 83,
+  "files": {
+    "audio/shot.wav": {
+      "sample_rate": 22050,
+      "channels": 1,
+      "bits": 16,
+      "samples": 5292,
+      "peak": 25558,
+      "sha256": "32d2e5ea26a9333f8163f7653c9b5a7dc00cf16ac9956f4abfbf32802ca459a7"
+    },
+    "audio/death.wav": {
+      "sample_rate": 22050,
+      "channels": 1,
+      "bits": 16,
+      "samples": 19845,
+      "peak": 25558,
+      "sha256": "3bf364c2fa21dbaca81af03e9d2e19552ede430912e1bd4fd967da0611a0c438"
+    }
+  }
+}
diff --git a/examples/mods/iron_coast_boss/audio/death.wav b/examples/mods/iron_coast_boss/audio/death.wav
new file mode 100644
index 00000000..e60b8402
Binary files /dev/null and b/examples/mods/iron_coast_boss/audio/death.wav differ
diff --git a/examples/mods/iron_coast_boss/audio/shot.wav b/examples/mods/iron_coast_boss/audio/shot.wav
new file mode 100644
index 00000000..1903eb98
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diff --git a/examples/mods/iron_coast_boss/build_assets.py b/examples/mods/iron_coast_boss/build_assets.py
new file mode 100644
index 00000000..496fcc88
--- /dev/null
+++ b/examples/mods/iron_coast_boss/build_assets.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python3
+"""Convert saved imagegen artwork and synthesize reproducible package-local WAVs.
+
+This script resizes/atlases supplied art; it never redraws source or generated art.
+Generated source PNGs stay in ignored art/. See prompts/ and provenance.json.
+Use --audio-only to regenerate sound without Pillow or private artwork.
+"""
+import argparse
+import hashlib
+import json
+import math
+from pathlib import Path
+import random
+import struct
+import wave
+
+
+def sounds(root, kind):
+    rate = 22050
+    values = {
+        "scout": (0.11, 1400, 380, 0.34, 230, 19),
+        "turret": (0.18, 900, 160, 0.52, 150, 37),
+        "boss": (0.24, 500, 80, 0.90, 75, 83),
+    }
+    shot_length, start, end, death_length, bass, seed = values[kind]
+    (root / "audio").mkdir(exist_ok=True)
+    stats = {}
+    for name, duration in [("shot", shot_length), ("death", death_length)]:
+        rng = random.Random(seed + (100 if name == "death" else 0))
+        count = int(duration * rate)
+        phase = low_noise = 0.0
+        samples = []
+        for index in range(count):
+            t = index / rate
+            position = index / max(1, count - 1)
+            noise = rng.uniform(-1, 1)
+            low_noise = low_noise * 0.86 + noise * 0.14
+            if name == "shot":
+                frequency = end + (start - end) * (1 - position) ** 2
+                phase += 2 * math.pi * frequency / rate
+                value = (0.60 * math.sin(phase) + 0.15 * math.sin(2.31 * phase)
+                         + 0.16 * noise + 0.16 * math.sin(2 * math.pi * bass * t))
+                envelope = min(1, t / 0.002) * math.exp(-position * 6.0)
+            else:
+                frequency = bass * (1.0 - position * 0.65)
+                phase += 2 * math.pi * frequency / rate
+                value = 0.62 * low_noise + 0.19 * noise + 0.28 * math.sin(phase)
+                envelope = min(1, t / 0.003) * math.exp(-position * 4.7)
+            # Five milliseconds at the tail avoid discontinuities at mixer retirement.
+            envelope *= min(1, (count - 1 - index) / (rate * 0.005))
+            samples.append(value * max(0, envelope))
+        peak = max(abs(value) for value in samples)
+        pcm = [round(value / peak * 0.78 * 32767) for value in samples]
+        path = root / "audio" / (name + ".wav")
+        with wave.open(str(path), "wb") as output:
+            output.setnchannels(1)
+            output.setsampwidth(2)
+            output.setframerate(rate)
+            output.writeframes(struct.pack("<" + "h" * len(pcm), *pcm))
+        stats[str(path.relative_to(root))] = {
+            "sample_rate": rate, "channels": 1, "bits": 16,
+            "samples": count, "peak": max(abs(value) for value in pcm),
+            "sha256": hashlib.sha256(path.read_bytes()).hexdigest(),
+        }
+    (root / "audio-recipe.json").write_text(json.dumps({
+        "generator": "build_assets.py deterministic chirp/noise synthesis; no recordings",
+        "kind": kind, "seed": seed, "files": stats,
+    }, indent=2) + "\n")
+
+
+def artwork(root, kind):
+    from PIL import Image
+    dimensions = {"scout": (24, 24), "turret": (32, 32), "boss": (96, 64)}
+    width, height = dimensions[kind]
+    paths = [root / "art/unit-generated-v1.png"]
+    if kind == "boss":
+        paths.append(root / "art/unit-charge-generated-v1.png")
+    hd_frames, sd_frames = [], []
+    stats = []
+    for path in paths:
+        source = Image.open(path).convert("RGBA")
+        if source.width * height != source.height * width:
+            raise ValueError(f"{path}: source canvas aspect differs from logical canvas")
+        # Identical canvas resize and padding for all frames retain their registration.
+        hd = Image.new("RGBA", (width * 8, height * 8), (0, 0, 0, 0))
+        pad_x, pad_y = width // 3, height // 3
+        resized = source.resize((hd.width - 2 * pad_x, hd.height - 2 * pad_y), Image.Resampling.LANCZOS)
+        hd.alpha_composite(resized, (pad_x, pad_y))
+        sd = hd.resize((width, height), Image.Resampling.BOX)
+        for image in [hd, sd]:
+            bbox = image.getchannel("A").point(lambda value: 255 if value >= 128 else 0).getbbox()
+            if bbox is None or bbox[0] == 0 or bbox[1] == 0 or bbox[2] == image.width or bbox[3] == image.height:
+                raise ValueError(f"{path}: opaque silhouette touches logical canvas edge")
+        hd_frames.append(hd)
+        sd_frames.append(sd)
+        stats.append({"source": str(path.relative_to(root)),
+                      "source_sha256": hashlib.sha256(path.read_bytes()).hexdigest(),
+                      "sd_opaque_bounds": list(sd.getchannel("A").point(lambda value: 255 if value >= 128 else 0).getbbox())})
+    for name, frames in [("unit-hd.png", hd_frames), ("unit-sd.png", sd_frames)]:
+        atlas = Image.new("RGBA", (frames[0].width * len(frames), frames[0].height), (0, 0, 0, 0))
+        for index, frame in enumerate(frames):
+            atlas.alpha_composite(frame, (index * frame.width, 0))
+        atlas.save(root / "art" / name)
+    # Shared visual ammunition language; each package includes its own local copy.
+    source = Image.open(root / "art/projectile-generated-v1.png").convert("RGBA")
+    hd = source.resize((64, 64), Image.Resampling.LANCZOS)
+    hd.save(root / "art/projectile-hd.png")
+    hd.resize((8, 8), Image.Resampling.BOX).save(root / "art/projectile-sd.png")
+    metadata = {"logical_size": [width, height], "hd_scale": 8, "origin": [0, 0],
+                "frames": len(paths), "frame_order": ["idle", "charged"][:len(paths)],
+                "alpha": "Preserved RGBA; runtime uses alpha>=128 indexed transparency",
+                "registration": "Common full-canvas resize and equal padding for every frame",
+                "sources": stats}
+    if len(hd_frames) == 2:
+        masks = [f.getchannel("A").point(lambda value: 255 if value >= 128 else 0) for f in hd_frames]
+        pairs = list(zip(masks[0].get_flattened_data(), masks[1].get_flattened_data()))
+        metadata["animation_silhouette_overlap"] = sum(bool(a and b) for a, b in pairs) / sum(bool(a or b) for a, b in pairs)
+        if metadata["animation_silhouette_overlap"] < 0.99:
+            raise ValueError("generated animation changes the silhouette beyond accepted registration tolerance")
+    (root / "art-qa.json").write_text(json.dumps(metadata, indent=2) + "\n")
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--audio-only", action="store_true")
+    args = parser.parse_args()
+    root = Path(__file__).resolve().parent
+    kind = root.name.removeprefix("iron_coast_")
+    sounds(root, kind)
+    if not args.audio_only:
+        artwork(root, kind)
+    print(f"Generated {root.name} package assets")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/examples/mods/iron_coast_boss/content.json b/examples/mods/iron_coast_boss/content.json
new file mode 100644
index 00000000..7aa7f2d6
--- /dev/null
+++ b/examples/mods/iron_coast_boss/content.json
@@ -0,0 +1,59 @@
+{
+  "weapons": [
+    {
+      "id": "iron_coast_boss:projectile",
+      "name": "Iron Coast Command Cruiser cannon shell",
+      "damage": 3,
+      "speed": 4,
+      "cooldown": 54,
+      "behavior": "straight",
+      "target": "all",
+      "art": {
+        "png": "art/projectile-sd.png",
+        "hd_png": "art/projectile-hd.png",
+        "logical_width": 8,
+        "logical_height": 8
+      }
+    }
+  ],
+  "enemies": [
+    {
+      "id": "iron_coast_boss:unit",
+      "name": "Iron Coast Command Cruiser",
+      "health": 160,
+      "speed": 0,
+      "reward": 1800,
+      "ground": false,
+      "boss": true,
+      "cooldown": 54,
+      "art": {
+        "png": "art/unit-sd.png",
+        "hd_png": "art/unit-hd.png",
+        "logical_width": 96,
+        "logical_height": 64,
+        "frames": 2
+      },
+      "script": "scripts/ai.rhai"
+    }
+  ],
+  "sounds": [
+    {
+      "id": "iron_coast_boss:shot",
+      "name": "Iron Coast Command Cruiser cannon",
+      "file": "audio/shot.wav",
+      "volume": 95,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    },
+    {
+      "id": "iron_coast_boss:death",
+      "name": "Iron Coast Command Cruiser destruction",
+      "file": "audio/death.wav",
+      "volume": 120,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 4
+    }
+  ]
+}
diff --git a/examples/mods/iron_coast_boss/mod.toml b/examples/mods/iron_coast_boss/mod.toml
new file mode 100644
index 00000000..602b7b9b
--- /dev/null
+++ b/examples/mods/iron_coast_boss/mod.toml
@@ -0,0 +1,7 @@
+id = "iron_coast_boss"
+name = "Iron Coast Command Cruiser"
+version = "1.0.0"
+api_version = 1
+description = "A persistent patrol boss with a three-shell cannon fan. Includes SD and HD artwork, deterministic Rhai AI and generated sound effects."
+content = "content.json"
+scripts = ["scripts/ai.rhai"]
diff --git a/examples/mods/iron_coast_boss/prompts/projectile-hd-v1.txt b/examples/mods/iron_coast_boss/prompts/projectile-hd-v1.txt
new file mode 100644
index 00000000..92306a65
--- /dev/null
+++ b/examples/mods/iron_coast_boss/prompts/projectile-hd-v1.txt
@@ -0,0 +1,6 @@
+Use case: style-transfer
+Asset type: transparent HD projectile sprite for hostile cannon fire in a top-down military science-fiction shoot-em-up.
+Input: original Raptor ESHOT_BLK 8×8 amber projectile, enlarged nearest-neighbor, is a reference for color and readability.
+Primary request: a single small compact circular amber/orange energy shell viewed directly overhead, bright pale-yellow center fading to orange metal/plasma rim, dark crisp outer edge. Match the naval steel/amber Raptor remaster style. It will be reduced to an 8×8 logical square, so keep a simple readable round footprint and avoid microdetails. This is one ammunition projectile, no weapon or spacecraft.
+Composition: perfectly centered isolated circular sprite on square canvas, visible orb occupies about62% width/height with equal large transparent margins. Keep all glow contained inside the circular orb, no external haze, shadow, trail or rays. Do not stretch it.
+Constraints: true transparent background, no extra objects, no checkerboard or black background baked into pixels, no text, logos, watermarks, perspective or decorative framing.
diff --git a/examples/mods/iron_coast_boss/prompts/unit-charge-v1.txt b/examples/mods/iron_coast_boss/prompts/unit-charge-v1.txt
new file mode 100644
index 00000000..952025a8
--- /dev/null
+++ b/examples/mods/iron_coast_boss/prompts/unit-charge-v1.txt
@@ -0,0 +1,3 @@
+Use case: precise-object-edit
+Asset type: second animation frame of the Iron Coast Command Cruiser boss HD sprite.
+Input image is the completed sprite edit target. Create a charged-weapons variant changing ONLY the existing small amber lamps and the two central circular side cannon wells: slightly brighten those lamps and illuminate inside each cannon well with a compact amber/orange core. Keep every hull panel, prong, silhouette edge, x/y anchor, exact 3:2 image dimensions, and camera view pixel-aligned with the input. No new external glow, muzzle flash, particles, smoke or shadow. Preserve the exact transparent background and empty side margins. Add a thin transparent margin around top/bottom if necessary to avoid edge clipping, but do not shift or reshape the vessel. Do not render a background, text, logos or watermarks. Single isolated overhead sprite facing DOWN.
diff --git a/examples/mods/iron_coast_boss/prompts/unit-hd-v1.txt b/examples/mods/iron_coast_boss/prompts/unit-hd-v1.txt
new file mode 100644
index 00000000..9f2c3816
--- /dev/null
+++ b/examples/mods/iron_coast_boss/prompts/unit-hd-v1.txt
@@ -0,0 +1,6 @@
+Use case: style-transfer
+Asset type: transparent HD enemy boss sprite for a top-down vertical shoot-em-up, Iron Coast Command Cruiser.
+Input image: original Raptor SHIP32G1_PIC (96×64 logical canvas, enlarged nearest-neighbor) is the source of truth for silhouette, proportions, center anchoring and DOWNWARD orientation.
+Primary request: regenerate the pictured large military science-fiction coastal command cruiser as clean HD game art. Preserve the original very specific shape: tall central armored hull oriented vertically nose DOWN, twin small stern engine towers at the TOP, wide lateral blocky wing/weapon platforms across the upper-middle, a central bridge/reactor block, and two prongs flanking the narrow lower bow. Keep all sections recognizable and in the same positions. Heavy naval steel/slate plates, subtle olive and brown industrial accents, bolted hatches, narrow amber status lamps, small red service panels. Original utilitarian Raptor overhead sprite style with sharper surface detail. It is one aircraft/hover cruiser rather than a ship floating in water.
+Composition: a WIDE 3:2 transparent canvas corresponding exactly to96×64 logical pixels. Full perfectly top-down view without perspective. Cruiser centered on x48,y32. Keep original transparent side margins: actual vessel about55% of canvas width and94% of canvas height, with no clipping or cropped tips. Bow points downward. Do not rotate or enlarge the vessel to fill the side margins. Gentle light from upper-left, crisp silhouette, no external shadow.
+Constraints: one isolated single sprite, true transparent background. No sea, terrain, floor, wake, exhaust trails, motion blur, text, logos, watermark, smoke, UI, borders or painted checkerboard. Preserve the attached silhouette and exact canvas proportions.
diff --git a/examples/mods/iron_coast_boss/provenance.json b/examples/mods/iron_coast_boss/provenance.json
new file mode 100644
index 00000000..d840a8a4
--- /dev/null
+++ b/examples/mods/iron_coast_boss/provenance.json
@@ -0,0 +1,36 @@
+{
+  "api_version": 1,
+  "mod_version": "1.0.0",
+  "tool": "built-in image_gen.imagegen via imagegen skill",
+  "skill": "/home/quintine/.codex/skills/.system/imagegen/SKILL.md",
+  "generated_at": "2026-10-10",
+  "source_reference": {
+    "asset_id_hex": "10335",
+    "catalog_path": "sprites/SHIP32G1_PIC",
+    "sha256": "640ed8f1d45ead01337ce2ed95a1be1b44f88fe0cfecdc61e98537093d1e9324",
+    "role": "Original silhouette/orientation/style reference inspected before imagegen. Original reference pixels excluded from Git under art/source/."
+  },
+  "assets": [
+    {
+      "file": "art/unit-generated-v1.png",
+      "prompt": "prompts/unit-hd-v1.txt",
+      "tool_output": "exec-3e7092b2-f469-4d4d-9eee-c7d760172125.png",
+      "sha256": "87d644a5d584ad82e285241e3a5cdc58e5c61fa851415a4d6660e0ae83ec5e85"
+    },
+    {
+      "file": "art/unit-charge-generated-v1.png",
+      "prompt": "prompts/unit-charge-v1.txt",
+      "tool_output": "exec-7a5f11a2-bb90-4007-81c1-865e2058f912.png",
+      "sha256": "cc8401140982260b4675a0a28fd209b8ed8d636e4cd4fa98a9cdf2fed37b1bff"
+    },
+    {
+      "file": "art/projectile-generated-v1.png",
+      "prompt": "prompts/projectile-hd-v1.txt",
+      "tool_output": "exec-96076703-18b2-4aad-9bce-4eaceef4d8bd.png",
+      "note": "Common generated amber projectile copied into each independent package.",
+      "sha256": "386709d83ebf8a9e6c5119c785afc77152ae934780b3b0afcf8ede510622bc20"
+    }
+  ],
+  "pipeline": "build_assets.py: common full-canvas resize/padding, alpha-preserving RGBA SD/8xHD strips; no bitmap redraw",
+  "version_control": "Generated masters, shipped SD/HD artwork, previews and synthesized WAVs included in Git per user request. Original catalog reference pixels excluded."
+}
diff --git a/examples/mods/iron_coast_boss/scripts/ai.rhai b/examples/mods/iron_coast_boss/scripts/ai.rhai
new file mode 100644
index 00000000..e017efae
--- /dev/null
+++ b/examples/mods/iron_coast_boss/scripts/ai.rhai
@@ -0,0 +1,56 @@
+fn is_alive(event) {
+    for unit in event.entities {
+        if unit.entity == event.entity && unit.health > 0 { return true; }
+    }
+    false
+}
+
+// Per-entity directions permit multiple cruisers without sharing a patrol cursor.
+fn on_spawn(event, state, random) {
+    if !is_alive(event) { return #{ commands: [], state: state }; }
+    if !state.contains("directions") { state.directions = #{}; }
+    state.directions[event.entity.to_string()] = 1;
+    #{ commands: [#{ op: "velocity", entity: event.entity, vx: 0, vy: 2 }], state: state }
+}
+
+fn on_tick(event, state, random) {
+    if event.health <= 0 || !is_alive(event) { return #{ commands: [], state: state }; }
+    if event.y < 24 {
+        return #{ commands: [#{ op: "velocity", entity: event.entity, vx: 0, vy: 2 }], state: state };
+    }
+    let key = event.entity.to_string();
+    if !state.contains("directions") { state.directions = #{}; }
+    let direction = if state.directions.contains(key) { state.directions[key] } else { 1 };
+    if event.x >= 144 { direction = -1; }
+    if event.x <= 80 { direction = 1; }
+    state.directions[key] = direction;
+    let commands = [
+        #{ op: "move", entity: event.entity, x: event.x, y: 24 },
+        #{ op: "velocity", entity: event.entity, vx: direction, vy: 0 }
+    ];
+    if event.tick % 54 == 0 {
+        commands.push(#{ op: "projectile", weapon: "iron_coast_boss:projectile", x: event.x + 35, y: 64, vx: -2, vy: 4, hostile: true });
+        commands.push(#{ op: "projectile", weapon: "iron_coast_boss:projectile", x: event.x + 48, y: 64, vx: 0, vy: 4, hostile: true });
+        commands.push(#{ op: "projectile", weapon: "iron_coast_boss:projectile", x: event.x + 61, y: 64, vx: 2, vy: 4, hostile: true });
+        commands.push(#{ op: "play_sound", sound: "iron_coast_boss:shot" });
+        state.shots = if state.contains("shots") { state.shots + 1 } else { 1 };
+    }
+    #{ commands: commands, state: state }
+}
+
+fn on_hit(event, state, random) {
+    state.hits = if state.contains("hits") { state.hits + 1 } else { 1 };
+    #{ commands: [], state: state }
+}
+
+fn on_death(event, state, random) {
+    if state.contains("directions") { state.directions.remove(event.entity.to_string()); }
+    state.destroyed = if state.contains("destroyed") { state.destroyed + 1 } else { 1 };
+    let defeated = if event.objectives.contains("iron_coast_boss:defeated") { event.objectives["iron_coast_boss:defeated"] + 1 } else { 1 };
+    #{ commands: [
+        #{ op: "objective", key: "iron_coast_boss:defeated", value: defeated },
+        #{ op: "effect", x: event.x + 35, y: event.y + 36 },
+        #{ op: "effect", x: event.x + 61, y: event.y + 36 },
+        #{ op: "play_sound", sound: "iron_coast_boss:death" }
+    ], state: state }
+}
diff --git a/examples/mods/iron_coast_mission_1/README.md b/examples/mods/iron_coast_mission_1/README.md
new file mode 100644
index 00000000..04fd3633
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/README.md
@@ -0,0 +1,29 @@
+# Iron Coast — Mission 1: Breakwater
+
+Enable this package and its six dependencies in the in-game Mods screen:
+`iron_coast_scout`, `iron_coast_turret`, `iron_coast_boss`, `pulse_cannon`,
+`seeker_swarm`, and `ion_lance`. Each package is independent and version 1.0.0.
+Choose **Iron Coast 1 — Breakwater** in the mission list.
+
+Disable at least two harbor turrets and destroy the command ship to complete
+the raid. Scout waves arrive during the approach; two supply depots release
+repair kits. The mission grants a trial Pulse Cannon and three field repairs.
+Repairs restore 25 shield when selected and used with the special button.
+Victory awards 5,000 credits in addition to ordinary destruction rewards.
+
+This mission uses explicit script completion. Its duration is a catalog hint;
+waiting out the timer cannot win. The boss stays in the firing corridor, and
+the two central turrets can be hit with starter forward guns. Equipment and
+mission progress remain subject to the normal mod-save compatibility checks.
+
+The generated masters, packaged SD/HD PNGs and synthesized WAVs are included
+in Git with their definitions, scripts, generator, prompts and validation
+report. Original game data and the original style-reference PNGs remain
+outside Git. The three
+`art/*-source-hd.png` inputs were generated with the built-in imagegen tool
+using the original terrain and military sprite as style/scale references.
+Run `python3 examples/mods/iron_coast_mission_1/build_assets.py --palette
+data/misc/PALETTE_DAT` to regenerate the exact
+packaged crops, SD palette conversion, HD footprints and synthesized WAVs.
+See `prompts.md`, `asset-report.json`, and `docs/iron-coast.md` for provenance
+and validation limits.
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diff --git a/examples/mods/iron_coast_mission_1/art/tile_212_hd.png b/examples/mods/iron_coast_mission_1/art/tile_212_hd.png
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diff --git a/examples/mods/iron_coast_mission_1/art/tile_212_sd.png b/examples/mods/iron_coast_mission_1/art/tile_212_sd.png
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diff --git a/examples/mods/iron_coast_mission_1/art/tile_213_hd.png b/examples/mods/iron_coast_mission_1/art/tile_213_hd.png
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diff --git a/examples/mods/iron_coast_mission_1/art/tile_213_sd.png b/examples/mods/iron_coast_mission_1/art/tile_213_sd.png
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diff --git a/examples/mods/iron_coast_mission_1/art/tile_214_sd.png b/examples/mods/iron_coast_mission_1/art/tile_214_sd.png
new file mode 100644
index 00000000..baa25232
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diff --git a/examples/mods/iron_coast_mission_1/art/tile_215_hd.png b/examples/mods/iron_coast_mission_1/art/tile_215_hd.png
new file mode 100644
index 00000000..57fbee1b
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diff --git a/examples/mods/iron_coast_mission_1/art/tile_215_sd.png b/examples/mods/iron_coast_mission_1/art/tile_215_sd.png
new file mode 100644
index 00000000..2ec19443
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diff --git a/examples/mods/iron_coast_mission_1/asset-report.json b/examples/mods/iron_coast_mission_1/asset-report.json
new file mode 100644
index 00000000..30e4b074
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/asset-report.json
@@ -0,0 +1,79 @@
+{
+  "tile_count": 216,
+  "tile_logical_size": [
+    32,
+    32
+  ],
+  "hd_tile_size": [
+    128,
+    128
+  ],
+  "sd_palette_colors": 256,
+  "palette_sha256": "1cf6adb926d1dee1888b3e3d33b51a7049b3e5eb5f90a3067ef71c8970547204",
+  "vertical_repeat": "12 rows forward + 12 rows reflected; matching boundary pixels",
+  "seam_checks_passed": true,
+  "depot_transparent_pixels": 623,
+  "audio": {
+    "approach": {
+      "file": "audio/approach.wav",
+      "samples": 19845,
+      "seconds": 0.9,
+      "sha256": "148cf8ef6b521ef27dcca06f29af5d360f146c057a9b8dc1f793503993acb3cd"
+    },
+    "dock_alarm": {
+      "file": "audio/dock_alarm.wav",
+      "samples": 22050,
+      "seconds": 1.0,
+      "sha256": "441275e69c4070859962c75bae2736db17596dfd4d05a298c1d8128be6214180"
+    },
+    "boss_alarm": {
+      "file": "audio/boss_alarm.wav",
+      "samples": 24255,
+      "seconds": 1.1,
+      "sha256": "865d2e14156645071e4d918d406ff744e6bfd15f68360ce8d7888fce422d798f"
+    },
+    "victory": {
+      "file": "audio/victory.wav",
+      "samples": 26460,
+      "seconds": 1.2,
+      "sha256": "df9c2e3aaa2e2811b8f4920d7e0bfffa4edba0e57c65d0d9fb5520115e4ecc93"
+    },
+    "depot_open": {
+      "file": "audio/depot_open.wav",
+      "samples": 7717,
+      "seconds": 0.35,
+      "sha256": "373abe2cbf75f2d511a26705ed39837ded766f7a52ab7949a408399ad1ac3736"
+    },
+    "repair_use": {
+      "file": "audio/repair_use.wav",
+      "samples": 13230,
+      "seconds": 0.6,
+      "sha256": "0a56bbaa3bcfd486a06ce24ebfb31753c6e69d530b45b5ffb54ee7015a06741a"
+    }
+  },
+  "actual_sd_unique_colors": 122,
+  "sd_pixels_match_original_palette": true,
+  "sources": {
+    "terrain-source-hd.png": {
+      "size": [
+        1086,
+        1448
+      ],
+      "sha256": "1b31977372192fd1f597f7bd07fae9dd9a4d6004fcacca2278569b175bea5989"
+    },
+    "briefing-source-hd.png": {
+      "size": [
+        1586,
+        992
+      ],
+      "sha256": "f41f3197a0290e560271fcd5306f555a42522e46b33a4ed32e1d042659dd869f"
+    },
+    "depot-source-hd.png": {
+      "size": [
+        1254,
+        1254
+      ],
+      "sha256": "3aef4edd440c1eec7570ce5edce9825b1a65b55bf5472b8e594488874d45818c"
+    }
+  }
+}
diff --git a/examples/mods/iron_coast_mission_1/audio/approach.wav b/examples/mods/iron_coast_mission_1/audio/approach.wav
new file mode 100644
index 00000000..6a068006
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diff --git a/examples/mods/iron_coast_mission_1/audio/boss_alarm.wav b/examples/mods/iron_coast_mission_1/audio/boss_alarm.wav
new file mode 100644
index 00000000..b1e8b0b0
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diff --git a/examples/mods/iron_coast_mission_1/audio/depot_open.wav b/examples/mods/iron_coast_mission_1/audio/depot_open.wav
new file mode 100644
index 00000000..76733986
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diff --git a/examples/mods/iron_coast_mission_1/audio/dock_alarm.wav b/examples/mods/iron_coast_mission_1/audio/dock_alarm.wav
new file mode 100644
index 00000000..4b52bd5a
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diff --git a/examples/mods/iron_coast_mission_1/audio/repair_use.wav b/examples/mods/iron_coast_mission_1/audio/repair_use.wav
new file mode 100644
index 00000000..6bdc8f09
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diff --git a/examples/mods/iron_coast_mission_1/audio/victory.wav b/examples/mods/iron_coast_mission_1/audio/victory.wav
new file mode 100644
index 00000000..82a976b2
Binary files /dev/null and b/examples/mods/iron_coast_mission_1/audio/victory.wav differ
diff --git a/examples/mods/iron_coast_mission_1/build_assets.py b/examples/mods/iron_coast_mission_1/build_assets.py
new file mode 100644
index 00000000..c9b71e21
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/build_assets.py
@@ -0,0 +1,135 @@
+#!/usr/bin/env python3
+"""Package imagegen sources into palette SD/HD game footprints and synthesize WAVs.
+
+This performs deterministic cropping/resampling/palette conversion, not image
+generation. The three imagegen originals remain beside the packaged local files.
+"""
+import argparse
+import hashlib
+import json
+import math
+import random
+import struct
+import wave
+from pathlib import Path
+from PIL import Image, ImageOps
+
+ROOT = Path(__file__).resolve().parent
+
+
+def palette_image(path):
+    raw = path.read_bytes()
+    if len(raw) != 768:
+        raise ValueError("expected the original 768-byte VGA palette")
+    colors = [(min(value, 63) << 2) | (min(value, 63) >> 4) for value in raw]
+    palette = Image.new("P", (1, 1))
+    palette.putpalette(colors)
+    return palette, colors
+
+
+def sd(image, size, palette):
+    image = image.convert("RGBA").resize(size, Image.Resampling.LANCZOS)
+    alpha = image.getchannel("A").point(lambda a: 255 if a >= 128 else 0)
+    # Use one full-canvas palette pass before splitting terrain, so tile borders
+    # receive identical context and no independent quantizer creates seams.
+    rgb = image.convert("RGB").quantize(palette=palette, dither=Image.Dither.NONE).convert("RGBA")
+    rgb.putalpha(alpha)
+    return rgb
+
+
+def wav(name, duration, notes, mode="tone"):
+    sample_rate = 22050
+    rng = random.Random(7053 + sum(map(ord, name)))
+    values = bytearray()
+    count = int(duration * sample_rate)
+    for frame in range(count):
+        t = frame / sample_rate
+        section = min(len(notes) - 1, int(t / duration * len(notes)))
+        frequency = notes[section]
+        local = (t / duration * len(notes)) % 1
+        envelope = min(1, local * 18) * (1 - local) ** 0.8
+        signal = math.sin(2 * math.pi * frequency * t)
+        signal += 0.24 * math.sin(2 * math.pi * frequency * 2 * t)
+        if mode == "metal":
+            signal += 0.45 * rng.uniform(-1, 1) * math.exp(-t * 15)
+            signal += 0.3 * math.sin(2 * math.pi * 817 * t) * math.exp(-t * 10)
+        if mode == "alarm":
+            signal += 0.25 * math.sin(2 * math.pi * frequency * 0.5 * t)
+        value = max(-32767, min(32767, int(signal * envelope * 7200)))
+        values += struct.pack("<h", value)
+    path = ROOT / "audio" / (name + ".wav")
+    with wave.open(str(path), "wb") as output:
+        output.setnchannels(1)
+        output.setsampwidth(2)
+        output.setframerate(sample_rate)
+        output.writeframes(values)
+    return {"file": str(path.relative_to(ROOT)), "samples": count, "seconds": duration,
+            "sha256": hashlib.sha256(path.read_bytes()).hexdigest()}
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--palette", type=Path, default=ROOT.parents[2] / "data/misc/PALETTE_DAT")
+    args = parser.parse_args()
+    art = ROOT / "art"
+    (ROOT / "audio").mkdir(exist_ok=True)
+    palette, colors = palette_image(args.palette)
+    terrain = Image.open(art / "terrain-source-hd.png").convert("RGBA")
+    terrain_hd = terrain.resize((1152, 1536), Image.Resampling.LANCZOS)
+    terrain_sd = sd(terrain, (288, 384), palette)
+    tile_count = 0
+    for reverse in (False, True):
+        hd_map = ImageOps.flip(terrain_hd) if reverse else terrain_hd
+        sd_map = ImageOps.flip(terrain_sd) if reverse else terrain_sd
+        for row in range(12):
+            for col in range(9):
+                number = tile_count
+                hd_tile = hd_map.crop((col * 128, row * 128, (col + 1) * 128, (row + 1) * 128))
+                sd_tile = sd_map.crop((col * 32, row * 32, (col + 1) * 32, (row + 1) * 32))
+                hd_tile.save(art / f"tile_{number:03}_hd.png")
+                sd_tile.save(art / f"tile_{number:03}_sd.png")
+                tile_count += 1
+    # Ping-pong ordering makes both repetition boundaries identical without
+    # painting over generated artwork. Validate every seam across the period.
+    assert terrain_sd.crop((0, 383, 288, 384)).tobytes() == ImageOps.flip(terrain_sd).crop((0, 0, 288, 1)).tobytes()
+    assert ImageOps.flip(terrain_sd).crop((0, 383, 288, 384)).tobytes() == terrain_sd.crop((0, 0, 288, 1)).tobytes()
+    assert terrain_hd.crop((0, 1535, 1152, 1536)).tobytes() == ImageOps.flip(terrain_hd).crop((0, 0, 1152, 1)).tobytes()
+    terrain_sd.save(art / "terrain-preview-sd.png")
+    terrain_hd.save(art / "terrain-preview-hd.png")
+    briefing = Image.open(art / "briefing-source-hd.png").convert("RGBA")
+    sd(briefing, (320, 200), palette).save(art / "briefing_sd.png")
+    briefing.resize((1280, 800), Image.Resampling.LANCZOS).save(art / "briefing_hd.png")
+    depot = Image.open(art / "depot-source-hd.png").convert("RGBA")
+    sd(depot, (32, 32), palette).save(art / "depot_sd.png")
+    depot.resize((128, 128), Image.Resampling.LANCZOS).save(art / "depot_hd.png")
+    sd(depot, (16, 16), palette).save(art / "repair_sd.png")
+    depot.resize((64, 64), Image.Resampling.LANCZOS).save(art / "repair_hd.png")
+    audio = {
+        "approach": wav("approach", 0.9, [110, 165, 220]),
+        "dock_alarm": wav("dock_alarm", 1.0, [330, 220, 330, 220], "alarm"),
+        "boss_alarm": wav("boss_alarm", 1.1, [196, 147, 110], "alarm"),
+        "victory": wav("victory", 1.2, [262, 330, 392, 524]),
+        "depot_open": wav("depot_open", 0.35, [120], "metal"),
+        "repair_use": wav("repair_use", 0.6, [440, 554, 660]),
+    }
+    report = {"tile_count": tile_count, "tile_logical_size": [32, 32],
+              "hd_tile_size": [128, 128], "sd_palette_colors": 256,
+              "palette_sha256": hashlib.sha256(args.palette.read_bytes()).hexdigest(),
+              "vertical_repeat": "12 rows forward + 12 rows reflected; matching boundary pixels",
+              "seam_checks_passed": True,
+              "depot_transparent_pixels": sum(1 for a in Image.open(art / "depot_sd.png").getchannel("A").tobytes() if a == 0),
+              "audio": audio}
+    palette_colors = set(tuple(colors[i:i+3]) for i in range(0, 768, 3))
+    actual_colors = set(tuple(terrain_sd.convert("RGB").tobytes()[i:i+3]) for i in range(0, 288*384*3, 3))
+    assert actual_colors <= palette_colors
+    report["actual_sd_unique_colors"] = len(actual_colors)
+    report["sd_pixels_match_original_palette"] = True
+    report["sources"] = {path.name: {"size": Image.open(path).size,
+                          "sha256": hashlib.sha256(path.read_bytes()).hexdigest()}
+                          for path in art.glob("*-source-hd.png")}
+    (ROOT / "asset-report.json").write_text(json.dumps(report, indent=2) + "\n")
+    print(f"Packaged {tile_count} SD/HD tiles, briefing/depot/repair art and {len(audio)} WAVs")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/examples/mods/iron_coast_mission_1/content.json b/examples/mods/iron_coast_mission_1/content.json
new file mode 100644
index 00000000..89a0df54
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/content.json
@@ -0,0 +1,2829 @@
+{
+  "sounds": [
+    {
+      "id": "iron_coast_mission_1:approach",
+      "name": "Approach",
+      "file": "audio/approach.wav",
+      "volume": 82,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    },
+    {
+      "id": "iron_coast_mission_1:dock_alarm",
+      "name": "Dock Alarm",
+      "file": "audio/dock_alarm.wav",
+      "volume": 72,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    },
+    {
+      "id": "iron_coast_mission_1:boss_alarm",
+      "name": "Boss Alarm",
+      "file": "audio/boss_alarm.wav",
+      "volume": 96,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 1
+    },
+    {
+      "id": "iron_coast_mission_1:victory",
+      "name": "Victory",
+      "file": "audio/victory.wav",
+      "volume": 96,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 1
+    },
+    {
+      "id": "iron_coast_mission_1:depot_open",
+      "name": "Depot Open",
+      "file": "audio/depot_open.wav",
+      "volume": 82,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    },
+    {
+      "id": "iron_coast_mission_1:repair_use",
+      "name": "Repair Use",
+      "file": "audio/repair_use.wav",
+      "volume": 82,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    }
+  ],
+  "items": [
+    {
+      "id": "iron_coast_mission_1:repair",
+      "name": "Iron Coast Field Repair",
+      "price": 750,
+      "max_count": 5,
+      "initial_count": 1,
+      "special": true,
+      "consumable": true,
+      "art": {
+        "png": "art/repair_sd.png",
+        "hd_png": "art/repair_hd.png",
+        "logical_width": 16,
+        "logical_height": 16,
+        "frames": 1
+      },
+      "script": "scripts/repair.rhai"
+    }
+  ],
+  "enemies": [
+    {
+      "id": "iron_coast_mission_1:depot",
+      "name": "Harbor Supply Depot",
+      "health": 12,
+      "speed": 0,
+      "reward": 225,
+      "ground": true,
+      "drop": "iron_coast_mission_1:repair",
+      "art": {
+        "png": "art/depot_sd.png",
+        "hd_png": "art/depot_hd.png",
+        "logical_width": 32,
+        "logical_height": 32,
+        "frames": 1
+      },
+      "script": "scripts/depot.rhai"
+    }
+  ],
+  "missions": [
+    {
+      "id": "iron_coast_mission_1:mission_01",
+      "name": "Iron Coast 1 \u2014 Breakwater",
+      "duration": 2000,
+      "auto_complete": false,
+      "columns": 9,
+      "layout": [
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+      ],
+      "spawns": [
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+        },
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+        },
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+        },
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+          "y": -32
+        },
+        {
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+          "enemy": "iron_coast_mission_1:depot",
+          "x": 144,
+          "y": -32
+        },
+        {
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+          "x": 88,
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+        },
+        {
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+        },
+        {
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+          "enemy": "iron_coast_mission_1:depot",
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+          "y": -32
+        },
+        {
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+          "enemy": "iron_coast_scout:unit",
+          "x": 72,
+          "y": -24
+        },
+        {
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+          "enemy": "iron_coast_scout:unit",
+          "x": 210,
+          "y": -24
+        },
+        {
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+          "enemy": "iron_coast_turret:unit",
+          "x": 240,
+          "y": -32
+        },
+        {
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+          "enemy": "iron_coast_scout:unit",
+          "x": 136,
+          "y": -24
+        },
+        {
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+          "enemy": "iron_coast_boss:unit",
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+          "y": -64
+        }
+      ],
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+        "logical_height": 200,
+        "frames": 1
+      },
+      "script": "scripts/mission.rhai"
+    }
+  ],
+  "campaigns": [
+    {
+      "id": "iron_coast_mission_1:campaign",
+      "name": "Iron Coast",
+      "missions": [
+        "iron_coast_mission_1:mission_01"
+      ],
+      "art": {
+        "png": "art/briefing_sd.png",
+        "hd_png": "art/briefing_hd.png",
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+        "logical_height": 200,
+        "frames": 1
+      }
+    }
+  ]
+}
diff --git a/examples/mods/iron_coast_mission_1/mod.toml b/examples/mods/iron_coast_mission_1/mod.toml
new file mode 100644
index 00000000..2f5ff9a4
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/mod.toml
@@ -0,0 +1,15 @@
+id = "iron_coast_mission_1"
+name = "Iron Coast — Mission 1: Breakwater"
+version = "1.0.0"
+api_version = 1
+description = "Raid an industrial shoreline, disable two harbor turrets and destroy the Breakwater command ship. Includes SD/HD port terrain, supply depots, a trial Pulse Cannon and synthesized mission audio."
+content = "content.json"
+scripts = ["scripts/mission.rhai", "scripts/depot.rhai", "scripts/repair.rhai"]
+
+[dependencies]
+iron_coast_scout = "^1.0"
+iron_coast_turret = "^1.0"
+iron_coast_boss = "^1.0"
+pulse_cannon = "^1.0"
+seeker_swarm = "^1.0"
+ion_lance = "^1.0"
diff --git a/examples/mods/iron_coast_mission_1/prompts.json b/examples/mods/iron_coast_mission_1/prompts.json
new file mode 100644
index 00000000..fc3e6b93
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/prompts.json
@@ -0,0 +1,9 @@
+{
+  "generator": "built-in image_gen.imagegen",
+  "date": "2026-10-10",
+  "prompts": {
+    "terrain": "Use case: stylized-concept. Asset type: actual scrolling terrain texture for a top-down 2D arcade shoot-em-up game, Iron Coast Mission 1. Image 1 is a style reference: original Raptor terrain; Image 2 is a scale and shading reference: original military sprite. Generate a new detailed HD terrain map texture, flat orthographic directly overhead camera with absolutely no perspective. Industrial shoreline raid: dark slate blue seawater on the left third, a worn gray concrete seawall, docks and a paved industrial port covering the right two thirds. Rust-red metal loading pads, restrained yellow safety lines, small pipes and low relief machinery. Military science-fiction 1990s sprite aesthetics upgraded with clean readable material details. Opaque image; no text, labels, aircraft, enemies, people, UI, map markers, dramatic lighting or painted illustration. Tall rectangular composition, preferably 1152x1536, intended to split into 9 columns by 12 rows of equal 128 pixel square tiles. All details must be real top-down texture, lighting uniformly from upper left. Vertical top and bottom edge strips must be identical quiet water/concrete textures to allow seamless vertical repetition; left/right edge strips quiet surface textures. Keep player projectile visibility high, mid-dark values, realistic logical scale 32 pixels per tile. Do not draw a tile grid or borders.",
+    "briefing": "Use case: stylized-concept. Asset type: Iron Coast Mission 1 game briefing and mission-menu background. Reference image is the generated gameplay shoreline texture and defines the same gray concrete docks, slate sea, rust-red industrial port and yellow hazard markings. Create a detailed HD top-down orthographic military-science-fiction arcade-game map image, a wide composition corresponding to a 320x200 logical game screen. A fortified industrial harbor beside a dark sea, a wide straight coastal road and three armored docking platforms; no aircraft or enemies, no text, labels, grid, borders, UI or interface. Restrained Raptor-era game sprite palette, uniformly lit from upper left, readable surfaces and compact machinery. Leave the central upper area simple and dark enough for separately rendered bitmap briefing text. Keep all structures actually viewed directly overhead with no perspective or horizon. This must be an actual game asset, not a poster or screenshot. No watermark.",
+    "depot": "Use case: stylized-concept. Asset type: actual transparent top-down game sprite for a destructible industrial supply depot in Iron Coast Mission 1. Reference 1 is the original Raptor terrain palette and pixel style; reference 2 is the new Iron Coast terrain and industrial material style. Generate one compact square cluster of rust-red metal supply crates and a small dark olive fuel tank, with yellow hazard corners, a tiny readable white repair cross on one crate, and steel tie-down brackets. Direct orthographic overhead camera, no perspective. The depot will occupy exactly one 32x32 logical sprite canvas, HD output 256x256 preferred, keep complete silhouette within the central 85 percent with clear transparent margin. Uniform upper-left lighting, crisp silhouette, restrained 1990s military science-fiction arcade shading upgraded with readable material detail. No floor, background, terrain, shadow outside silhouette, text, words, border, logo, watermark or extra objects. Genuinely transparent background, not a checkerboard. This is a game sprite viewed directly overhead, not an angled 3D product render."
+  }
+}
diff --git a/examples/mods/iron_coast_mission_1/prompts.md b/examples/mods/iron_coast_mission_1/prompts.md
new file mode 100644
index 00000000..d4035e28
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/prompts.md
@@ -0,0 +1,63 @@
+# Image provenance
+
+Generated with the built-in `image_gen.imagegen` tool on 2026-10-10. Original
+local catalog assets `0x10360` (terrain, 32×32) and `0x102f6` (military sprite,
+24×24) were decoded and visually inspected before generation. Reference PNGs
+remain outside Git under `.reference/`; original assets remain in `data/`.
+
+## Terrain source
+
+Use case: stylized-concept. Actual scrolling terrain texture for a top-down
+2D arcade shoot-em-up, Iron Coast Mission 1. Original Raptor terrain and
+military sprite are style/scale references. Flat orthographic overhead view:
+dark slate blue seawater on the left third, worn gray concrete seawall and
+paved industrial port on the right. Rust-red loading pads, restrained yellow
+safety lines, pipes and compact machinery. Readable 1990s military
+science-fiction sprite aesthetics with HD material details. Opaque tall
+composition, requested 1152×1536, split into nine columns and twelve rows of
+128-pixel tiles. Uniform upper-left lighting. Quiet matching vertical edge
+strips, no tile grid, text, aircraft, enemies, UI, perspective or watermark.
+
+Source: `art/terrain-source-hd.png`; built-in output
+`exec-24f2ac88-7f7c-4a13-8d7f-9e6a04dc209f.png`.
+
+## Briefing/menu source
+
+Use case: stylized-concept. Actual game briefing and mission-menu background,
+referencing the generated shoreline terrain. Detailed overhead military
+science-fiction harbor, wide composition for a 320×200 logical screen: dark
+sea, fortified industrial docks, coastal road and armored docking platforms.
+Uniform upper-left lighting, restrained sprite palette, clear dark upper area
+for separately rendered bitmap text. No aircraft, enemies, text, labels,
+grid, border, UI, perspective, horizon or watermark.
+
+Source: `art/briefing-source-hd.png`; built-in output
+`exec-4eb2c607-7c0b-4b9e-b646-ffbd16665672.png`.
+
+## Destructible depot source
+
+Use case: stylized-concept. Actual transparent overhead game sprite, using
+original terrain and new shoreline as style references: compact square
+rust-red supply crates and dark olive fuel tank, yellow hazard corners,
+repair cross and steel tie-downs. Complete silhouette on a 32×32 logical
+canvas with transparent margin, requested 256×256 HD output. Uniform
+upper-left lighting, crisp military science-fiction shading. No floor,
+background, terrain, external shadow, words, border, logo or watermark.
+Genuinely transparent background.
+
+Source: `art/depot-source-hd.png`; built-in output
+`exec-65871adc-7bcd-40bd-bbf8-01230bb02b31.png`.
+
+## Packaging and audio
+
+Sources are retained without repainting. `build_assets.py` performs whole-map
+resampling, palette conversion, cropping and reflection. Terrain is repeated
+as twelve forward rows plus twelve reflected rows so repeat boundary pixels
+match exactly; structures therefore recur in reflected blocks. Individual
+tiles are cropped after the global SD pass to retain neighboring context.
+
+Audio is original procedural synthesis from deterministic sine/harmonic
+oscillators and seeded noise. Approach, dock warning, boss warning, victory,
+depot impact and repair cues are mono PCM16 at 22,050 Hz, 0.35–1.2 seconds.
+No original sound recording or external SoundFont was used. Generator seeds,
+sample counts and SHA-256 output hashes are recorded in `asset-report.json`.
diff --git a/examples/mods/iron_coast_mission_1/scripts/depot.rhai b/examples/mods/iron_coast_mission_1/scripts/depot.rhai
new file mode 100644
index 00000000..d844cbcc
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/scripts/depot.rhai
@@ -0,0 +1,10 @@
+fn on_death(event,state,random) {
+    let opened=0;
+    if event.objectives.contains("iron_coast_mission_1:depots_opened") {
+        opened=event.objectives["iron_coast_mission_1:depots_opened"];
+    }
+    #{commands:[
+        #{op:"objective",key:"iron_coast_mission_1:depots_opened",value:opened+1},
+        #{op:"play_sound",sound:"iron_coast_mission_1:depot_open"}
+    ],state:state}
+}
diff --git a/examples/mods/iron_coast_mission_1/scripts/mission.rhai b/examples/mods/iron_coast_mission_1/scripts/mission.rhai
new file mode 100644
index 00000000..dccc8f8c
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/scripts/mission.rhai
@@ -0,0 +1,48 @@
+fn on_mission_start(event, state, random) {
+    #{commands:[
+        #{op:"give_item", item:"pulse_cannon:equipment", count:1},
+        #{op:"give_item", item:"iron_coast_mission_1:repair", count:3},
+        #{op:"objective", key:"iron_coast_mission_1:phase", value:1},
+        #{op:"objective", key:"iron_coast_mission_1:turrets_required", value:2},
+        #{op:"objective", key:"iron_coast_mission_1:complete", value:0},
+        #{op:"play_sound", sound:"iron_coast_mission_1:approach"}
+    ],state:#{dock_alarm:false,boss_alarm:false,complete:false}}
+}
+
+fn on_tick(event, state, random) {
+    let commands=[];
+    if event.tick>=280 && !state.dock_alarm {
+        state.dock_alarm=true;
+        commands.push(#{op:"objective",key:"iron_coast_mission_1:phase",value:2});
+        commands.push(#{op:"play_sound",sound:"iron_coast_mission_1:dock_alarm"});
+    }
+    if event.tick>=720 && !state.boss_alarm {
+        state.boss_alarm=true;
+        commands.push(#{op:"objective",key:"iron_coast_mission_1:phase",value:3});
+        commands.push(#{op:"play_sound",sound:"iron_coast_mission_1:boss_alarm"});
+    }
+    let turrets=0;
+    if event.objectives.contains("iron_coast_turret:defeated") {
+        turrets=event.objectives["iron_coast_turret:defeated"];
+    }
+    let boss=0;
+    if event.objectives.contains("iron_coast_boss:defeated") {
+        boss=event.objectives["iron_coast_boss:defeated"];
+    }
+    // Surviving turrets must be disabled even if the command ship died first.
+    if turrets>=2 && boss>=1 && !state.complete {
+        state.complete=true;
+        commands.push(#{op:"objective",key:"iron_coast_mission_1:phase",value:4});
+        commands.push(#{op:"objective",key:"iron_coast_mission_1:complete",value:1});
+        commands.push(#{op:"credits",amount:5000});
+        commands.push(#{op:"play_sound",sound:"iron_coast_mission_1:victory"});
+        commands.push(#{op:"complete"});
+    }
+    #{commands:commands,state:state}
+}
+
+fn on_mission_end(event,state,random) {
+    let value=0;
+    if event.success {value=1;}
+    #{commands:[#{op:"objective",key:"iron_coast_mission_1:debrief",value:value}],state:state}
+}
diff --git a/examples/mods/iron_coast_mission_1/scripts/repair.rhai b/examples/mods/iron_coast_mission_1/scripts/repair.rhai
new file mode 100644
index 00000000..e48cf1aa
--- /dev/null
+++ b/examples/mods/iron_coast_mission_1/scripts/repair.rhai
@@ -0,0 +1,6 @@
+fn on_use(event,state,random) {
+    #{commands:[
+        #{op:"shield",amount:25},
+        #{op:"play_sound",sound:"iron_coast_mission_1:repair_use"}
+    ],state:state}
+}
diff --git a/examples/mods/iron_coast_scout/README.md b/examples/mods/iron_coast_scout/README.md
new file mode 100644
index 00000000..723c4831
--- /dev/null
+++ b/examples/mods/iron_coast_scout/README.md
@@ -0,0 +1,17 @@
+# Iron Coast Scout
+
+Independent version 1.0.0 enemy package for mod API 1. Enable/disable it from the in-game Mods screen and use it in any mission through `iron_coast_scout:unit`. Iron Coast mission 1 supplies placements and completion objectives; this package does not add a mission or override base content.
+
+Airborne interceptor weaves left/right every 24 ticks, advances 1 pixel/tick, aims at the pilot and fires a 2 damage shell.
+
+Logical collision canvas `24×24`, top-left anchor `(0,0)`, health `14`, reward `75` credits, firing interval `54` simulation ticks. The engine halves boss health on difficulties 0/1; difficulty 2/3 uses the declared health. SD mode uses `art/unit-sd.png`; enable HD art in Settings for `art/unit-hd.png`. The HD canvas is 8× logical resolution and bypasses automatic ScaleNx. Projectile artwork has an 8×8 logical canvas and an independent 64×64 HD version.
+
+The boss uses two registered frames (idle/amber charged); the scout and turret use stable single frames. All supplied variants stay on the same canvas and anchor. `art-qa.json` records transparency bounds and, for the boss, animation silhouette overlap.
+
+Enemy deaths increment the current mission objective `iron_coast_scout:defeated`. Persistent script `destroyed`, `hits` and `shots` counters are statistics; current-mission objectives reset when the mission restarts. Callbacks guard retired entities and use deterministic simulation data. No wall clock or unseeded random input enters the scripts.
+
+Generated PNG masters, SD/HD strips, previews and WAV sounds are included in Git. Original reference images under `art/source/` are excluded. Exact built-in imagegen prompts are in `prompts/`, with source IDs and generated-image provenance in `provenance.json`.
+
+To rebuild derived artwork from supplied generated masters and regenerate audio, install Pillow and run `python3 build_assets.py`. To regenerate only audio with the Python standard library, run `python3 build_assets.py --audio-only`. WAVs are original procedural mono 16-bit PCM at 22050 Hz; `audio-recipe.json` records deterministic seeds, sizes and hashes. The art pipeline resizes and assembles supplied images; it does not redraw them.
+
+Validate from the repository root: `cargo run -- --mods examples/mods --validate-mods iron_coast_scout`. Synthetic behavior and save/replay tests: `cargo test --test enemies_mods`. Verify shipped artwork locally: `cargo test --test enemies_mods shipped_enemy_assets_are_valid_and_aligned`.
diff --git a/examples/mods/iron_coast_scout/art-qa.json b/examples/mods/iron_coast_scout/art-qa.json
new file mode 100644
index 00000000..14531f45
--- /dev/null
+++ b/examples/mods/iron_coast_scout/art-qa.json
@@ -0,0 +1,29 @@
+{
+  "logical_size": [
+    24,
+    24
+  ],
+  "hd_scale": 8,
+  "origin": [
+    0,
+    0
+  ],
+  "frames": 1,
+  "frame_order": [
+    "idle"
+  ],
+  "alpha": "Preserved RGBA; runtime uses alpha>=128 indexed transparency",
+  "registration": "Common full-canvas resize and equal padding for every frame",
+  "sources": [
+    {
+      "source": "art/unit-generated-v1.png",
+      "source_sha256": "e2b6a0df185bda2e368e05a02af883cb99f5960cd379ad9454003449e1321503",
+      "sd_opaque_bounds": [
+        3,
+        2,
+        22,
+        22
+      ]
+    }
+  ]
+}
diff --git a/examples/mods/iron_coast_scout/art/preview.png b/examples/mods/iron_coast_scout/art/preview.png
new file mode 100644
index 00000000..63a59a62
Binary files /dev/null and b/examples/mods/iron_coast_scout/art/preview.png differ
diff --git a/examples/mods/iron_coast_scout/art/projectile-generated-v1.png b/examples/mods/iron_coast_scout/art/projectile-generated-v1.png
new file mode 100644
index 00000000..b1d1da06
Binary files /dev/null and b/examples/mods/iron_coast_scout/art/projectile-generated-v1.png differ
diff --git a/examples/mods/iron_coast_scout/art/projectile-hd.png b/examples/mods/iron_coast_scout/art/projectile-hd.png
new file mode 100644
index 00000000..07fc070a
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diff --git a/examples/mods/iron_coast_scout/art/projectile-sd.png b/examples/mods/iron_coast_scout/art/projectile-sd.png
new file mode 100644
index 00000000..f3231717
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diff --git a/examples/mods/iron_coast_scout/art/unit-generated-v1.png b/examples/mods/iron_coast_scout/art/unit-generated-v1.png
new file mode 100644
index 00000000..684371e4
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diff --git a/examples/mods/iron_coast_scout/art/unit-hd.png b/examples/mods/iron_coast_scout/art/unit-hd.png
new file mode 100644
index 00000000..d322a55f
Binary files /dev/null and b/examples/mods/iron_coast_scout/art/unit-hd.png differ
diff --git a/examples/mods/iron_coast_scout/art/unit-sd.png b/examples/mods/iron_coast_scout/art/unit-sd.png
new file mode 100644
index 00000000..f39e2bca
Binary files /dev/null and b/examples/mods/iron_coast_scout/art/unit-sd.png differ
diff --git a/examples/mods/iron_coast_scout/audio-recipe.json b/examples/mods/iron_coast_scout/audio-recipe.json
new file mode 100644
index 00000000..af208d6b
--- /dev/null
+++ b/examples/mods/iron_coast_scout/audio-recipe.json
@@ -0,0 +1,23 @@
+{
+  "generator": "build_assets.py deterministic chirp/noise synthesis; no recordings",
+  "kind": "scout",
+  "seed": 19,
+  "files": {
+    "audio/shot.wav": {
+      "sample_rate": 22050,
+      "channels": 1,
+      "bits": 16,
+      "samples": 2425,
+      "peak": 25558,
+      "sha256": "094e3398d598762ac1d1eed70c7e3177e56f525c726385945e5071f4e215a00f"
+    },
+    "audio/death.wav": {
+      "sample_rate": 22050,
+      "channels": 1,
+      "bits": 16,
+      "samples": 7497,
+      "peak": 25558,
+      "sha256": "066c916daecaa06358ea2fe99b482b9ce115e0f9a63296664063a738dca5212e"
+    }
+  }
+}
diff --git a/examples/mods/iron_coast_scout/audio/death.wav b/examples/mods/iron_coast_scout/audio/death.wav
new file mode 100644
index 00000000..7a038416
Binary files /dev/null and b/examples/mods/iron_coast_scout/audio/death.wav differ
diff --git a/examples/mods/iron_coast_scout/audio/shot.wav b/examples/mods/iron_coast_scout/audio/shot.wav
new file mode 100644
index 00000000..de239e11
Binary files /dev/null and b/examples/mods/iron_coast_scout/audio/shot.wav differ
diff --git a/examples/mods/iron_coast_scout/build_assets.py b/examples/mods/iron_coast_scout/build_assets.py
new file mode 100644
index 00000000..496fcc88
--- /dev/null
+++ b/examples/mods/iron_coast_scout/build_assets.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python3
+"""Convert saved imagegen artwork and synthesize reproducible package-local WAVs.
+
+This script resizes/atlases supplied art; it never redraws source or generated art.
+Generated source PNGs stay in ignored art/. See prompts/ and provenance.json.
+Use --audio-only to regenerate sound without Pillow or private artwork.
+"""
+import argparse
+import hashlib
+import json
+import math
+from pathlib import Path
+import random
+import struct
+import wave
+
+
+def sounds(root, kind):
+    rate = 22050
+    values = {
+        "scout": (0.11, 1400, 380, 0.34, 230, 19),
+        "turret": (0.18, 900, 160, 0.52, 150, 37),
+        "boss": (0.24, 500, 80, 0.90, 75, 83),
+    }
+    shot_length, start, end, death_length, bass, seed = values[kind]
+    (root / "audio").mkdir(exist_ok=True)
+    stats = {}
+    for name, duration in [("shot", shot_length), ("death", death_length)]:
+        rng = random.Random(seed + (100 if name == "death" else 0))
+        count = int(duration * rate)
+        phase = low_noise = 0.0
+        samples = []
+        for index in range(count):
+            t = index / rate
+            position = index / max(1, count - 1)
+            noise = rng.uniform(-1, 1)
+            low_noise = low_noise * 0.86 + noise * 0.14
+            if name == "shot":
+                frequency = end + (start - end) * (1 - position) ** 2
+                phase += 2 * math.pi * frequency / rate
+                value = (0.60 * math.sin(phase) + 0.15 * math.sin(2.31 * phase)
+                         + 0.16 * noise + 0.16 * math.sin(2 * math.pi * bass * t))
+                envelope = min(1, t / 0.002) * math.exp(-position * 6.0)
+            else:
+                frequency = bass * (1.0 - position * 0.65)
+                phase += 2 * math.pi * frequency / rate
+                value = 0.62 * low_noise + 0.19 * noise + 0.28 * math.sin(phase)
+                envelope = min(1, t / 0.003) * math.exp(-position * 4.7)
+            # Five milliseconds at the tail avoid discontinuities at mixer retirement.
+            envelope *= min(1, (count - 1 - index) / (rate * 0.005))
+            samples.append(value * max(0, envelope))
+        peak = max(abs(value) for value in samples)
+        pcm = [round(value / peak * 0.78 * 32767) for value in samples]
+        path = root / "audio" / (name + ".wav")
+        with wave.open(str(path), "wb") as output:
+            output.setnchannels(1)
+            output.setsampwidth(2)
+            output.setframerate(rate)
+            output.writeframes(struct.pack("<" + "h" * len(pcm), *pcm))
+        stats[str(path.relative_to(root))] = {
+            "sample_rate": rate, "channels": 1, "bits": 16,
+            "samples": count, "peak": max(abs(value) for value in pcm),
+            "sha256": hashlib.sha256(path.read_bytes()).hexdigest(),
+        }
+    (root / "audio-recipe.json").write_text(json.dumps({
+        "generator": "build_assets.py deterministic chirp/noise synthesis; no recordings",
+        "kind": kind, "seed": seed, "files": stats,
+    }, indent=2) + "\n")
+
+
+def artwork(root, kind):
+    from PIL import Image
+    dimensions = {"scout": (24, 24), "turret": (32, 32), "boss": (96, 64)}
+    width, height = dimensions[kind]
+    paths = [root / "art/unit-generated-v1.png"]
+    if kind == "boss":
+        paths.append(root / "art/unit-charge-generated-v1.png")
+    hd_frames, sd_frames = [], []
+    stats = []
+    for path in paths:
+        source = Image.open(path).convert("RGBA")
+        if source.width * height != source.height * width:
+            raise ValueError(f"{path}: source canvas aspect differs from logical canvas")
+        # Identical canvas resize and padding for all frames retain their registration.
+        hd = Image.new("RGBA", (width * 8, height * 8), (0, 0, 0, 0))
+        pad_x, pad_y = width // 3, height // 3
+        resized = source.resize((hd.width - 2 * pad_x, hd.height - 2 * pad_y), Image.Resampling.LANCZOS)
+        hd.alpha_composite(resized, (pad_x, pad_y))
+        sd = hd.resize((width, height), Image.Resampling.BOX)
+        for image in [hd, sd]:
+            bbox = image.getchannel("A").point(lambda value: 255 if value >= 128 else 0).getbbox()
+            if bbox is None or bbox[0] == 0 or bbox[1] == 0 or bbox[2] == image.width or bbox[3] == image.height:
+                raise ValueError(f"{path}: opaque silhouette touches logical canvas edge")
+        hd_frames.append(hd)
+        sd_frames.append(sd)
+        stats.append({"source": str(path.relative_to(root)),
+                      "source_sha256": hashlib.sha256(path.read_bytes()).hexdigest(),
+                      "sd_opaque_bounds": list(sd.getchannel("A").point(lambda value: 255 if value >= 128 else 0).getbbox())})
+    for name, frames in [("unit-hd.png", hd_frames), ("unit-sd.png", sd_frames)]:
+        atlas = Image.new("RGBA", (frames[0].width * len(frames), frames[0].height), (0, 0, 0, 0))
+        for index, frame in enumerate(frames):
+            atlas.alpha_composite(frame, (index * frame.width, 0))
+        atlas.save(root / "art" / name)
+    # Shared visual ammunition language; each package includes its own local copy.
+    source = Image.open(root / "art/projectile-generated-v1.png").convert("RGBA")
+    hd = source.resize((64, 64), Image.Resampling.LANCZOS)
+    hd.save(root / "art/projectile-hd.png")
+    hd.resize((8, 8), Image.Resampling.BOX).save(root / "art/projectile-sd.png")
+    metadata = {"logical_size": [width, height], "hd_scale": 8, "origin": [0, 0],
+                "frames": len(paths), "frame_order": ["idle", "charged"][:len(paths)],
+                "alpha": "Preserved RGBA; runtime uses alpha>=128 indexed transparency",
+                "registration": "Common full-canvas resize and equal padding for every frame",
+                "sources": stats}
+    if len(hd_frames) == 2:
+        masks = [f.getchannel("A").point(lambda value: 255 if value >= 128 else 0) for f in hd_frames]
+        pairs = list(zip(masks[0].get_flattened_data(), masks[1].get_flattened_data()))
+        metadata["animation_silhouette_overlap"] = sum(bool(a and b) for a, b in pairs) / sum(bool(a or b) for a, b in pairs)
+        if metadata["animation_silhouette_overlap"] < 0.99:
+            raise ValueError("generated animation changes the silhouette beyond accepted registration tolerance")
+    (root / "art-qa.json").write_text(json.dumps(metadata, indent=2) + "\n")
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--audio-only", action="store_true")
+    args = parser.parse_args()
+    root = Path(__file__).resolve().parent
+    kind = root.name.removeprefix("iron_coast_")
+    sounds(root, kind)
+    if not args.audio_only:
+        artwork(root, kind)
+    print(f"Generated {root.name} package assets")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/examples/mods/iron_coast_scout/content.json b/examples/mods/iron_coast_scout/content.json
new file mode 100644
index 00000000..873530fa
--- /dev/null
+++ b/examples/mods/iron_coast_scout/content.json
@@ -0,0 +1,60 @@
+{
+  "weapons": [
+    {
+      "id": "iron_coast_scout:projectile",
+      "name": "Iron Coast Scout cannon shell",
+      "damage": 2,
+      "speed": 3,
+      "cooldown": 54,
+      "behavior": "straight",
+      "target": "all",
+      "art": {
+        "png": "art/projectile-sd.png",
+        "hd_png": "art/projectile-hd.png",
+        "logical_width": 8,
+        "logical_height": 8
+      }
+    }
+  ],
+  "enemies": [
+    {
+      "id": "iron_coast_scout:unit",
+      "name": "Iron Coast Scout",
+      "health": 14,
+      "speed": 0,
+      "reward": 75,
+      "ground": false,
+      "boss": false,
+      "cooldown": 54,
+      "art": {
+        "png": "art/unit-sd.png",
+        "hd_png": "art/unit-hd.png",
+        "logical_width": 24,
+        "logical_height": 24,
+        "frames": 1
+      },
+      "script": "scripts/ai.rhai",
+      "weapon": "iron_coast_scout:projectile"
+    }
+  ],
+  "sounds": [
+    {
+      "id": "iron_coast_scout:shot",
+      "name": "Iron Coast Scout cannon",
+      "file": "audio/shot.wav",
+      "volume": 75,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    },
+    {
+      "id": "iron_coast_scout:death",
+      "name": "Iron Coast Scout destruction",
+      "file": "audio/death.wav",
+      "volume": 100,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 3
+    }
+  ]
+}
diff --git a/examples/mods/iron_coast_scout/mod.toml b/examples/mods/iron_coast_scout/mod.toml
new file mode 100644
index 00000000..302ef853
--- /dev/null
+++ b/examples/mods/iron_coast_scout/mod.toml
@@ -0,0 +1,7 @@
+id = "iron_coast_scout"
+name = "Iron Coast Scout"
+version = "1.0.0"
+api_version = 1
+description = "An agile weaving interceptor with amber cannon fire. Includes SD and HD artwork, deterministic Rhai AI and generated sound effects."
+content = "content.json"
+scripts = ["scripts/ai.rhai"]
diff --git a/examples/mods/iron_coast_scout/prompts/projectile-hd-v1.txt b/examples/mods/iron_coast_scout/prompts/projectile-hd-v1.txt
new file mode 100644
index 00000000..92306a65
--- /dev/null
+++ b/examples/mods/iron_coast_scout/prompts/projectile-hd-v1.txt
@@ -0,0 +1,6 @@
+Use case: style-transfer
+Asset type: transparent HD projectile sprite for hostile cannon fire in a top-down military science-fiction shoot-em-up.
+Input: original Raptor ESHOT_BLK 8×8 amber projectile, enlarged nearest-neighbor, is a reference for color and readability.
+Primary request: a single small compact circular amber/orange energy shell viewed directly overhead, bright pale-yellow center fading to orange metal/plasma rim, dark crisp outer edge. Match the naval steel/amber Raptor remaster style. It will be reduced to an 8×8 logical square, so keep a simple readable round footprint and avoid microdetails. This is one ammunition projectile, no weapon or spacecraft.
+Composition: perfectly centered isolated circular sprite on square canvas, visible orb occupies about62% width/height with equal large transparent margins. Keep all glow contained inside the circular orb, no external haze, shadow, trail or rays. Do not stretch it.
+Constraints: true transparent background, no extra objects, no checkerboard or black background baked into pixels, no text, logos, watermarks, perspective or decorative framing.
diff --git a/examples/mods/iron_coast_scout/prompts/unit-hd-v1.txt b/examples/mods/iron_coast_scout/prompts/unit-hd-v1.txt
new file mode 100644
index 00000000..e4b3e5d7
--- /dev/null
+++ b/examples/mods/iron_coast_scout/prompts/unit-hd-v1.txt
@@ -0,0 +1,6 @@
+Use case: style-transfer
+Asset type: transparent HD sprite for the Iron Coast Scout enemy, a top-down vertical shoot-em-up.
+Input image: the supplied original 24×24 Raptor SHIP39G1_PIC sprite is the source of truth for the silhouette and orientation, enlarged with nearest-neighbor only.
+Primary request: create one polished HD remaster of this small agile military science-fiction fighter, preserving the exact overhead view, V-shaped swept wings at the top and narrow central nose pointing straight DOWN. Naval steel/slate armor, subtle olive panels, restrained tiny amber engine vents and red service markings, crisp machined panel seams and readable shape. This is an enemy fighter facing down toward the player. Match the utilitarian 1990s Raptor design language while adding clean HD surface detail.
+Composition: centered on a square transparent canvas. Keep original proportions and symmetric straight-flight pose. Ship fills approximately 92% of canvas width and 92% of height, with a small equal transparent margin; no part clipped. No perspective, no rotation, no banking. No extra external parts or trails. Directional lighting gently from upper left, dark edges, no cast shadow outside ship.
+Constraints: one single isolated sprite, genuine transparent background, no lettering, logos, watermarks, environment, ground plane, drop shadow, border or checkerboard painted into pixels. Preserve alpha transparency and the original silhouette; do not put the ship in a photograph or poster.
diff --git a/examples/mods/iron_coast_scout/provenance.json b/examples/mods/iron_coast_scout/provenance.json
new file mode 100644
index 00000000..c76c08e9
--- /dev/null
+++ b/examples/mods/iron_coast_scout/provenance.json
@@ -0,0 +1,30 @@
+{
+  "api_version": 1,
+  "mod_version": "1.0.0",
+  "tool": "built-in image_gen.imagegen via imagegen skill",
+  "skill": "/home/quintine/.codex/skills/.system/imagegen/SKILL.md",
+  "generated_at": "2026-10-10",
+  "source_reference": {
+    "asset_id_hex": "10344",
+    "catalog_path": "sprites/SHIP39G1_PIC",
+    "sha256": "7cb09e925ea7786b331d576c360aad09b5e18f35d0258ec78ab5ef2e50c2590e",
+    "role": "Original silhouette/orientation/style reference inspected before imagegen. Original reference pixels excluded from Git under art/source/."
+  },
+  "assets": [
+    {
+      "file": "art/unit-generated-v1.png",
+      "prompt": "prompts/unit-hd-v1.txt",
+      "tool_output": "exec-3dc36f34-2cec-45f6-8262-ea3a5e577396.png",
+      "sha256": "e2b6a0df185bda2e368e05a02af883cb99f5960cd379ad9454003449e1321503"
+    },
+    {
+      "file": "art/projectile-generated-v1.png",
+      "prompt": "prompts/projectile-hd-v1.txt",
+      "tool_output": "exec-96076703-18b2-4aad-9bce-4eaceef4d8bd.png",
+      "note": "Common generated amber projectile copied into each independent package.",
+      "sha256": "386709d83ebf8a9e6c5119c785afc77152ae934780b3b0afcf8ede510622bc20"
+    }
+  ],
+  "pipeline": "build_assets.py: common full-canvas resize/padding, alpha-preserving RGBA SD/8xHD strips; no bitmap redraw",
+  "version_control": "Generated masters, shipped SD/HD artwork, previews and synthesized WAVs included in Git per user request. Original catalog reference pixels excluded."
+}
diff --git a/examples/mods/iron_coast_scout/scripts/ai.rhai b/examples/mods/iron_coast_scout/scripts/ai.rhai
new file mode 100644
index 00000000..669cfb18
--- /dev/null
+++ b/examples/mods/iron_coast_scout/scripts/ai.rhai
@@ -0,0 +1,40 @@
+fn is_alive(event) {
+    for unit in event.entities {
+        if unit.entity == event.entity && unit.health > 0 { return true; }
+    }
+    false
+}
+
+// Velocity changes are committed after the callback completes.
+fn on_spawn(event, state, random) {
+    if !is_alive(event) { return #{ commands: [], state: state }; }
+    #{ commands: [#{ op: "velocity", entity: event.entity, vx: 1, vy: 1 }], state: state }
+}
+
+fn on_tick(event, state, random) {
+    if event.health <= 0 || !is_alive(event) { return #{ commands: [], state: state }; }
+    let sideways = if ((event.tick + event.entity * 7) / 24) % 2 == 0 { 1 } else { -1 };
+    if event.x <= 24 { sideways = 1; }
+    if event.x >= 272 { sideways = -1; }
+    #{ commands: [#{ op: "velocity", entity: event.entity, vx: sideways, vy: 1 }], state: state }
+}
+
+fn on_fire(event, state, random) {
+    let shots = if state.contains("shots") { state.shots + 1 } else { 1 };
+    state.shots = shots;
+    #{ commands: [#{ op: "play_sound", sound: "iron_coast_scout:shot" }], state: state }
+}
+
+fn on_hit(event, state, random) {
+    state.hits = if state.contains("hits") { state.hits + 1 } else { 1 };
+    #{ commands: [], state: state }
+}
+
+fn on_death(event, state, random) {
+    state.destroyed = if state.contains("destroyed") { state.destroyed + 1 } else { 1 };
+    let defeated = if event.objectives.contains("iron_coast_scout:defeated") { event.objectives["iron_coast_scout:defeated"] + 1 } else { 1 };
+    #{ commands: [
+        #{ op: "objective", key: "iron_coast_scout:defeated", value: defeated },
+        #{ op: "play_sound", sound: "iron_coast_scout:death" }
+    ], state: state }
+}
diff --git a/examples/mods/iron_coast_turret/README.md b/examples/mods/iron_coast_turret/README.md
new file mode 100644
index 00000000..53bd7992
--- /dev/null
+++ b/examples/mods/iron_coast_turret/README.md
@@ -0,0 +1,17 @@
+# Iron Coast Turret
+
+Independent version 1.0.0 enemy package for mod API 1. Enable/disable it from the in-game Mods screen and use it in any mission through `iron_coast_turret:unit`. Iron Coast mission 1 supplies placements and completion objectives; this package does not add a mission or override base content.
+
+Ground emplacement scrolls with terrain at 1 pixel/tick and fires 3 damage aimed shells. Ground targeting rules still apply.
+
+Logical collision canvas `32×32`, top-left anchor `(0,0)`, health `30`, reward `120` credits, firing interval `70` simulation ticks. The engine halves boss health on difficulties 0/1; difficulty 2/3 uses the declared health. SD mode uses `art/unit-sd.png`; enable HD art in Settings for `art/unit-hd.png`. The HD canvas is 8× logical resolution and bypasses automatic ScaleNx. Projectile artwork has an 8×8 logical canvas and an independent 64×64 HD version.
+
+The boss uses two registered frames (idle/amber charged); the scout and turret use stable single frames. All supplied variants stay on the same canvas and anchor. `art-qa.json` records transparency bounds and, for the boss, animation silhouette overlap.
+
+Enemy deaths increment the current mission objective `iron_coast_turret:defeated`. Persistent script `destroyed`, `hits` and `shots` counters are statistics; current-mission objectives reset when the mission restarts. Callbacks guard retired entities and use deterministic simulation data. No wall clock or unseeded random input enters the scripts.
+
+Generated PNG masters, SD/HD strips, previews and WAV sounds are included in Git. Original reference images under `art/source/` are excluded. Exact built-in imagegen prompts are in `prompts/`, with source IDs and generated-image provenance in `provenance.json`.
+
+To rebuild derived artwork from supplied generated masters and regenerate audio, install Pillow and run `python3 build_assets.py`. To regenerate only audio with the Python standard library, run `python3 build_assets.py --audio-only`. WAVs are original procedural mono 16-bit PCM at 22050 Hz; `audio-recipe.json` records deterministic seeds, sizes and hashes. The art pipeline resizes and assembles supplied images; it does not redraw them.
+
+Validate from the repository root: `cargo run -- --mods examples/mods --validate-mods iron_coast_turret`. Synthetic behavior and save/replay tests: `cargo test --test enemies_mods`. Verify shipped artwork locally: `cargo test --test enemies_mods shipped_enemy_assets_are_valid_and_aligned`.
diff --git a/examples/mods/iron_coast_turret/art-qa.json b/examples/mods/iron_coast_turret/art-qa.json
new file mode 100644
index 00000000..24d6d6de
--- /dev/null
+++ b/examples/mods/iron_coast_turret/art-qa.json
@@ -0,0 +1,29 @@
+{
+  "logical_size": [
+    32,
+    32
+  ],
+  "hd_scale": 8,
+  "origin": [
+    0,
+    0
+  ],
+  "frames": 1,
+  "frame_order": [
+    "idle"
+  ],
+  "alpha": "Preserved RGBA; runtime uses alpha>=128 indexed transparency",
+  "registration": "Common full-canvas resize and equal padding for every frame",
+  "sources": [
+    {
+      "source": "art/unit-generated-v1.png",
+      "source_sha256": "37a7be58863d84028b01f67b133ae694d070cfe8155d939c0cbe81ca4ab621a7",
+      "sd_opaque_bounds": [
+        3,
+        2,
+        29,
+        30
+      ]
+    }
+  ]
+}
diff --git a/examples/mods/iron_coast_turret/art/preview.png b/examples/mods/iron_coast_turret/art/preview.png
new file mode 100644
index 00000000..27e45256
Binary files /dev/null and b/examples/mods/iron_coast_turret/art/preview.png differ
diff --git a/examples/mods/iron_coast_turret/art/projectile-generated-v1.png b/examples/mods/iron_coast_turret/art/projectile-generated-v1.png
new file mode 100644
index 00000000..b1d1da06
Binary files /dev/null and b/examples/mods/iron_coast_turret/art/projectile-generated-v1.png differ
diff --git a/examples/mods/iron_coast_turret/art/projectile-hd.png b/examples/mods/iron_coast_turret/art/projectile-hd.png
new file mode 100644
index 00000000..07fc070a
Binary files /dev/null and b/examples/mods/iron_coast_turret/art/projectile-hd.png differ
diff --git a/examples/mods/iron_coast_turret/art/projectile-sd.png b/examples/mods/iron_coast_turret/art/projectile-sd.png
new file mode 100644
index 00000000..f3231717
Binary files /dev/null and b/examples/mods/iron_coast_turret/art/projectile-sd.png differ
diff --git a/examples/mods/iron_coast_turret/art/unit-generated-v1.png b/examples/mods/iron_coast_turret/art/unit-generated-v1.png
new file mode 100644
index 00000000..8c9ac16c
Binary files /dev/null and b/examples/mods/iron_coast_turret/art/unit-generated-v1.png differ
diff --git a/examples/mods/iron_coast_turret/art/unit-hd.png b/examples/mods/iron_coast_turret/art/unit-hd.png
new file mode 100644
index 00000000..9714e8b7
Binary files /dev/null and b/examples/mods/iron_coast_turret/art/unit-hd.png differ
diff --git a/examples/mods/iron_coast_turret/art/unit-sd.png b/examples/mods/iron_coast_turret/art/unit-sd.png
new file mode 100644
index 00000000..17c9dc05
Binary files /dev/null and b/examples/mods/iron_coast_turret/art/unit-sd.png differ
diff --git a/examples/mods/iron_coast_turret/audio-recipe.json b/examples/mods/iron_coast_turret/audio-recipe.json
new file mode 100644
index 00000000..86f76485
--- /dev/null
+++ b/examples/mods/iron_coast_turret/audio-recipe.json
@@ -0,0 +1,23 @@
+{
+  "generator": "build_assets.py deterministic chirp/noise synthesis; no recordings",
+  "kind": "turret",
+  "seed": 37,
+  "files": {
+    "audio/shot.wav": {
+      "sample_rate": 22050,
+      "channels": 1,
+      "bits": 16,
+      "samples": 3969,
+      "peak": 25558,
+      "sha256": "0149d363391a8acfb61dbcbd76ba21a994dec58c4531b65fe0570e968b014308"
+    },
+    "audio/death.wav": {
+      "sample_rate": 22050,
+      "channels": 1,
+      "bits": 16,
+      "samples": 11466,
+      "peak": 25558,
+      "sha256": "3d891b723229608f96886f9fa15a33d39ab2f5e729177b98e9d0c0afebd24854"
+    }
+  }
+}
diff --git a/examples/mods/iron_coast_turret/audio/death.wav b/examples/mods/iron_coast_turret/audio/death.wav
new file mode 100644
index 00000000..92bb36a0
Binary files /dev/null and b/examples/mods/iron_coast_turret/audio/death.wav differ
diff --git a/examples/mods/iron_coast_turret/audio/shot.wav b/examples/mods/iron_coast_turret/audio/shot.wav
new file mode 100644
index 00000000..5a3b1f49
Binary files /dev/null and b/examples/mods/iron_coast_turret/audio/shot.wav differ
diff --git a/examples/mods/iron_coast_turret/build_assets.py b/examples/mods/iron_coast_turret/build_assets.py
new file mode 100644
index 00000000..496fcc88
--- /dev/null
+++ b/examples/mods/iron_coast_turret/build_assets.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python3
+"""Convert saved imagegen artwork and synthesize reproducible package-local WAVs.
+
+This script resizes/atlases supplied art; it never redraws source or generated art.
+Generated source PNGs stay in ignored art/. See prompts/ and provenance.json.
+Use --audio-only to regenerate sound without Pillow or private artwork.
+"""
+import argparse
+import hashlib
+import json
+import math
+from pathlib import Path
+import random
+import struct
+import wave
+
+
+def sounds(root, kind):
+    rate = 22050
+    values = {
+        "scout": (0.11, 1400, 380, 0.34, 230, 19),
+        "turret": (0.18, 900, 160, 0.52, 150, 37),
+        "boss": (0.24, 500, 80, 0.90, 75, 83),
+    }
+    shot_length, start, end, death_length, bass, seed = values[kind]
+    (root / "audio").mkdir(exist_ok=True)
+    stats = {}
+    for name, duration in [("shot", shot_length), ("death", death_length)]:
+        rng = random.Random(seed + (100 if name == "death" else 0))
+        count = int(duration * rate)
+        phase = low_noise = 0.0
+        samples = []
+        for index in range(count):
+            t = index / rate
+            position = index / max(1, count - 1)
+            noise = rng.uniform(-1, 1)
+            low_noise = low_noise * 0.86 + noise * 0.14
+            if name == "shot":
+                frequency = end + (start - end) * (1 - position) ** 2
+                phase += 2 * math.pi * frequency / rate
+                value = (0.60 * math.sin(phase) + 0.15 * math.sin(2.31 * phase)
+                         + 0.16 * noise + 0.16 * math.sin(2 * math.pi * bass * t))
+                envelope = min(1, t / 0.002) * math.exp(-position * 6.0)
+            else:
+                frequency = bass * (1.0 - position * 0.65)
+                phase += 2 * math.pi * frequency / rate
+                value = 0.62 * low_noise + 0.19 * noise + 0.28 * math.sin(phase)
+                envelope = min(1, t / 0.003) * math.exp(-position * 4.7)
+            # Five milliseconds at the tail avoid discontinuities at mixer retirement.
+            envelope *= min(1, (count - 1 - index) / (rate * 0.005))
+            samples.append(value * max(0, envelope))
+        peak = max(abs(value) for value in samples)
+        pcm = [round(value / peak * 0.78 * 32767) for value in samples]
+        path = root / "audio" / (name + ".wav")
+        with wave.open(str(path), "wb") as output:
+            output.setnchannels(1)
+            output.setsampwidth(2)
+            output.setframerate(rate)
+            output.writeframes(struct.pack("<" + "h" * len(pcm), *pcm))
+        stats[str(path.relative_to(root))] = {
+            "sample_rate": rate, "channels": 1, "bits": 16,
+            "samples": count, "peak": max(abs(value) for value in pcm),
+            "sha256": hashlib.sha256(path.read_bytes()).hexdigest(),
+        }
+    (root / "audio-recipe.json").write_text(json.dumps({
+        "generator": "build_assets.py deterministic chirp/noise synthesis; no recordings",
+        "kind": kind, "seed": seed, "files": stats,
+    }, indent=2) + "\n")
+
+
+def artwork(root, kind):
+    from PIL import Image
+    dimensions = {"scout": (24, 24), "turret": (32, 32), "boss": (96, 64)}
+    width, height = dimensions[kind]
+    paths = [root / "art/unit-generated-v1.png"]
+    if kind == "boss":
+        paths.append(root / "art/unit-charge-generated-v1.png")
+    hd_frames, sd_frames = [], []
+    stats = []
+    for path in paths:
+        source = Image.open(path).convert("RGBA")
+        if source.width * height != source.height * width:
+            raise ValueError(f"{path}: source canvas aspect differs from logical canvas")
+        # Identical canvas resize and padding for all frames retain their registration.
+        hd = Image.new("RGBA", (width * 8, height * 8), (0, 0, 0, 0))
+        pad_x, pad_y = width // 3, height // 3
+        resized = source.resize((hd.width - 2 * pad_x, hd.height - 2 * pad_y), Image.Resampling.LANCZOS)
+        hd.alpha_composite(resized, (pad_x, pad_y))
+        sd = hd.resize((width, height), Image.Resampling.BOX)
+        for image in [hd, sd]:
+            bbox = image.getchannel("A").point(lambda value: 255 if value >= 128 else 0).getbbox()
+            if bbox is None or bbox[0] == 0 or bbox[1] == 0 or bbox[2] == image.width or bbox[3] == image.height:
+                raise ValueError(f"{path}: opaque silhouette touches logical canvas edge")
+        hd_frames.append(hd)
+        sd_frames.append(sd)
+        stats.append({"source": str(path.relative_to(root)),
+                      "source_sha256": hashlib.sha256(path.read_bytes()).hexdigest(),
+                      "sd_opaque_bounds": list(sd.getchannel("A").point(lambda value: 255 if value >= 128 else 0).getbbox())})
+    for name, frames in [("unit-hd.png", hd_frames), ("unit-sd.png", sd_frames)]:
+        atlas = Image.new("RGBA", (frames[0].width * len(frames), frames[0].height), (0, 0, 0, 0))
+        for index, frame in enumerate(frames):
+            atlas.alpha_composite(frame, (index * frame.width, 0))
+        atlas.save(root / "art" / name)
+    # Shared visual ammunition language; each package includes its own local copy.
+    source = Image.open(root / "art/projectile-generated-v1.png").convert("RGBA")
+    hd = source.resize((64, 64), Image.Resampling.LANCZOS)
+    hd.save(root / "art/projectile-hd.png")
+    hd.resize((8, 8), Image.Resampling.BOX).save(root / "art/projectile-sd.png")
+    metadata = {"logical_size": [width, height], "hd_scale": 8, "origin": [0, 0],
+                "frames": len(paths), "frame_order": ["idle", "charged"][:len(paths)],
+                "alpha": "Preserved RGBA; runtime uses alpha>=128 indexed transparency",
+                "registration": "Common full-canvas resize and equal padding for every frame",
+                "sources": stats}
+    if len(hd_frames) == 2:
+        masks = [f.getchannel("A").point(lambda value: 255 if value >= 128 else 0) for f in hd_frames]
+        pairs = list(zip(masks[0].get_flattened_data(), masks[1].get_flattened_data()))
+        metadata["animation_silhouette_overlap"] = sum(bool(a and b) for a, b in pairs) / sum(bool(a or b) for a, b in pairs)
+        if metadata["animation_silhouette_overlap"] < 0.99:
+            raise ValueError("generated animation changes the silhouette beyond accepted registration tolerance")
+    (root / "art-qa.json").write_text(json.dumps(metadata, indent=2) + "\n")
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--audio-only", action="store_true")
+    args = parser.parse_args()
+    root = Path(__file__).resolve().parent
+    kind = root.name.removeprefix("iron_coast_")
+    sounds(root, kind)
+    if not args.audio_only:
+        artwork(root, kind)
+    print(f"Generated {root.name} package assets")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/examples/mods/iron_coast_turret/content.json b/examples/mods/iron_coast_turret/content.json
new file mode 100644
index 00000000..30c4ec1e
--- /dev/null
+++ b/examples/mods/iron_coast_turret/content.json
@@ -0,0 +1,60 @@
+{
+  "weapons": [
+    {
+      "id": "iron_coast_turret:projectile",
+      "name": "Iron Coast Turret cannon shell",
+      "damage": 3,
+      "speed": 3,
+      "cooldown": 70,
+      "behavior": "straight",
+      "target": "all",
+      "art": {
+        "png": "art/projectile-sd.png",
+        "hd_png": "art/projectile-hd.png",
+        "logical_width": 8,
+        "logical_height": 8
+      }
+    }
+  ],
+  "enemies": [
+    {
+      "id": "iron_coast_turret:unit",
+      "name": "Iron Coast Turret",
+      "health": 30,
+      "speed": 0,
+      "reward": 120,
+      "ground": true,
+      "boss": false,
+      "cooldown": 70,
+      "art": {
+        "png": "art/unit-sd.png",
+        "hd_png": "art/unit-hd.png",
+        "logical_width": 32,
+        "logical_height": 32,
+        "frames": 1
+      },
+      "script": "scripts/ai.rhai",
+      "weapon": "iron_coast_turret:projectile"
+    }
+  ],
+  "sounds": [
+    {
+      "id": "iron_coast_turret:shot",
+      "name": "Iron Coast Turret cannon",
+      "file": "audio/shot.wav",
+      "volume": 95,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    },
+    {
+      "id": "iron_coast_turret:death",
+      "name": "Iron Coast Turret destruction",
+      "file": "audio/death.wav",
+      "volume": 120,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 3
+    }
+  ]
+}
diff --git a/examples/mods/iron_coast_turret/mod.toml b/examples/mods/iron_coast_turret/mod.toml
new file mode 100644
index 00000000..5ff34846
--- /dev/null
+++ b/examples/mods/iron_coast_turret/mod.toml
@@ -0,0 +1,7 @@
+id = "iron_coast_turret"
+name = "Iron Coast Turret"
+version = "1.0.0"
+api_version = 1
+description = "Armored ground defense with aimed heavy shells. Includes SD and HD artwork, deterministic Rhai AI and generated sound effects."
+content = "content.json"
+scripts = ["scripts/ai.rhai"]
diff --git a/examples/mods/iron_coast_turret/prompts/projectile-hd-v1.txt b/examples/mods/iron_coast_turret/prompts/projectile-hd-v1.txt
new file mode 100644
index 00000000..92306a65
--- /dev/null
+++ b/examples/mods/iron_coast_turret/prompts/projectile-hd-v1.txt
@@ -0,0 +1,6 @@
+Use case: style-transfer
+Asset type: transparent HD projectile sprite for hostile cannon fire in a top-down military science-fiction shoot-em-up.
+Input: original Raptor ESHOT_BLK 8×8 amber projectile, enlarged nearest-neighbor, is a reference for color and readability.
+Primary request: a single small compact circular amber/orange energy shell viewed directly overhead, bright pale-yellow center fading to orange metal/plasma rim, dark crisp outer edge. Match the naval steel/amber Raptor remaster style. It will be reduced to an 8×8 logical square, so keep a simple readable round footprint and avoid microdetails. This is one ammunition projectile, no weapon or spacecraft.
+Composition: perfectly centered isolated circular sprite on square canvas, visible orb occupies about62% width/height with equal large transparent margins. Keep all glow contained inside the circular orb, no external haze, shadow, trail or rays. Do not stretch it.
+Constraints: true transparent background, no extra objects, no checkerboard or black background baked into pixels, no text, logos, watermarks, perspective or decorative framing.
diff --git a/examples/mods/iron_coast_turret/prompts/unit-hd-v1.txt b/examples/mods/iron_coast_turret/prompts/unit-hd-v1.txt
new file mode 100644
index 00000000..ea59481f
--- /dev/null
+++ b/examples/mods/iron_coast_turret/prompts/unit-hd-v1.txt
@@ -0,0 +1,6 @@
+Use case: style-transfer
+Asset type: transparent HD sprite for Iron Coast armored ground turret in a top-down vertical shoot-em-up.
+Input image: original 24×24 Raptor SHIP37G1_PIC enlarged nearest-neighbor, reference for the compact circular armored emplacement, overhead camera and utilitarian style. Adapt it to a 32×32 logical square canvas.
+Primary request: one HD remaster of a heavy oval/circular ground defense turret. Two parallel recessed cannon ports facing DOWN along the central vertical axis, surrounded by concentric naval steel and dark olive armored plates, small dark red inner gun wells, bolted side plating. Maintain the original compact oval footprint, fully overhead with no visible side walls or horizon; weapons belong to a stationary ground installation, not an aircraft. Restrained amber indicator lights. Readable dark outline and precise industrial panel detail.
+Composition: square canvas, centered, approximately 90% width and 90% height, symmetric and aligned on exact center; keep small equal transparent margins. Gentle top-left illumination, no external shadow. Cannon barrels remain contained within the turret footprint.
+Constraints: single isolated sprite, genuine transparent background, no ground, floor, text, logos, watermark, smoke, muzzle flash, trails, border or checkerboard painted into pixels. No perspective or rotation.
diff --git a/examples/mods/iron_coast_turret/provenance.json b/examples/mods/iron_coast_turret/provenance.json
new file mode 100644
index 00000000..401d9fc8
--- /dev/null
+++ b/examples/mods/iron_coast_turret/provenance.json
@@ -0,0 +1,30 @@
+{
+  "api_version": 1,
+  "mod_version": "1.0.0",
+  "tool": "built-in image_gen.imagegen via imagegen skill",
+  "skill": "/home/quintine/.codex/skills/.system/imagegen/SKILL.md",
+  "generated_at": "2026-10-10",
+  "source_reference": {
+    "asset_id_hex": "1033e",
+    "catalog_path": "sprites/SHIP37G1_PIC",
+    "sha256": "00a6f1bebfb75af8dafbef2b974417f95580827ebcf5181f5ba6712845eaf865",
+    "role": "Original silhouette/orientation/style reference inspected before imagegen. Original reference pixels excluded from Git under art/source/."
+  },
+  "assets": [
+    {
+      "file": "art/unit-generated-v1.png",
+      "prompt": "prompts/unit-hd-v1.txt",
+      "tool_output": "exec-6df0f241-f8a0-4552-80f6-e3d0aef35aad.png",
+      "sha256": "37a7be58863d84028b01f67b133ae694d070cfe8155d939c0cbe81ca4ab621a7"
+    },
+    {
+      "file": "art/projectile-generated-v1.png",
+      "prompt": "prompts/projectile-hd-v1.txt",
+      "tool_output": "exec-96076703-18b2-4aad-9bce-4eaceef4d8bd.png",
+      "note": "Common generated amber projectile copied into each independent package.",
+      "sha256": "386709d83ebf8a9e6c5119c785afc77152ae934780b3b0afcf8ede510622bc20"
+    }
+  ],
+  "pipeline": "build_assets.py: common full-canvas resize/padding, alpha-preserving RGBA SD/8xHD strips; no bitmap redraw",
+  "version_control": "Generated masters, shipped SD/HD artwork, previews and synthesized WAVs included in Git per user request. Original catalog reference pixels excluded."
+}
diff --git a/examples/mods/iron_coast_turret/scripts/ai.rhai b/examples/mods/iron_coast_turret/scripts/ai.rhai
new file mode 100644
index 00000000..bb34b0c8
--- /dev/null
+++ b/examples/mods/iron_coast_turret/scripts/ai.rhai
@@ -0,0 +1,27 @@
+// Ground emplacements inherit deterministic terrain scrolling (one pixel/tick).
+fn on_spawn(event, state, random) {
+    #{ commands: [], state: state }
+}
+
+fn on_tick(event, state, random) {
+    #{ commands: [], state: state }
+}
+
+fn on_fire(event, state, random) {
+    state.shots = if state.contains("shots") { state.shots + 1 } else { 1 };
+    #{ commands: [#{ op: "play_sound", sound: "iron_coast_turret:shot" }], state: state }
+}
+
+fn on_hit(event, state, random) {
+    state.hits = if state.contains("hits") { state.hits + 1 } else { 1 };
+    #{ commands: [], state: state }
+}
+
+fn on_death(event, state, random) {
+    state.destroyed = if state.contains("destroyed") { state.destroyed + 1 } else { 1 };
+    let defeated = if event.objectives.contains("iron_coast_turret:defeated") { event.objectives["iron_coast_turret:defeated"] + 1 } else { 1 };
+    #{ commands: [
+        #{ op: "objective", key: "iron_coast_turret:defeated", value: defeated },
+        #{ op: "play_sound", sound: "iron_coast_turret:death" }
+    ], state: state }
+}
diff --git a/examples/mods/pulse_cannon/ART_PROVENANCE.md b/examples/mods/pulse_cannon/ART_PROVENANCE.md
new file mode 100644
index 00000000..6c6ba8ea
--- /dev/null
+++ b/examples/mods/pulse_cannon/ART_PROVENANCE.md
@@ -0,0 +1,7 @@
+# pulse_cannon artwork provenance
+
+Generated locally with the built-in image generation tool and the imagegen skill. Original catalog IDs `0x102b1` (gray gun inventory icon) and `0x101cf` (8×8 projectile) were decoded and inspected as style/scale references. Original pixels are not included in the mod or Git. The prompt uses these references to create a distinct naval industrial weapon rather than copy the original.
+
+Generated master images, SD/HD sprites and sound WAVs are tracked with the package, as requested. Original game pixels and decoded reference images remain outside Git. The generated source is converted into 16×16/64×64 equipment canvases and a 8×12 logical projectile canvas plus its 4× HD counterpart. Transparent margins remain inside the logical canvas. Sound synthesis is deterministic, PCM16 mono 22,050 Hz; `generate_audio.py` is the complete reproduction source.
+
+Prompts and generated-source SHA256 hashes are recorded in `art-provenance.json` after output verification. Palette conversion occurs in the runtime loader; gameplay dimensions do not depend on HD artwork.
diff --git a/examples/mods/pulse_cannon/README.md b/examples/mods/pulse_cannon/README.md
new file mode 100644
index 00000000..28678dc2
--- /dev/null
+++ b/examples/mods/pulse_cannon/README.md
@@ -0,0 +1,9 @@
+# Pulse Cannon 1.0.0
+
+Enable **Pulse Cannon** in Mods and apply at the main menu. This independent API 1 example has no dependencies. Buy its equipment in the shop (6,500 credits, maximum one) or collect its pickup. It is a primary upgrade and fires alongside the starter guns.
+
+Projectile: 4 damage, 8 logical pixels per step, 9 step cooldown, `straight`, air and ground targets. Every third paired burst adds two angled shots using deterministic random values. Rhai stores bounded burst/hit counters and emits local firing/impact sounds and effects.
+
+`art/equipment-sd.png` is a 16×16 logical icon, `art/equipment-hd.png` its detailed 4× variant. Projectile canvases are 8×12 SD and 32×48 HD. Switch HD artwork in Options. The generated master images, SD/HD sprites, WAV files, provenance and reproduction inputs are tracked in Git. Original game assets and decoded reference images remain outside version control. `python3 generate_audio.py` reproduces both sound files.
+
+Validate locally with `cargo run --no-default-features -- --mods examples/mods --validate-mods pulse_cannon`. Read the shared [API documentation](../../../docs/modding-api.md) for save pins, dependencies and sandbox limits.
diff --git a/examples/mods/pulse_cannon/art-provenance.json b/examples/mods/pulse_cannon/art-provenance.json
new file mode 100644
index 00000000..6837eda8
--- /dev/null
+++ b/examples/mods/pulse_cannon/art-provenance.json
@@ -0,0 +1,65 @@
+{
+  "package": "pulse_cannon",
+  "tool": "built-in image_gen",
+  "skill": "/home/quintine/.codex/skills/.system/imagegen/SKILL.md",
+  "reference_role": "Original catalog sprites inspected as style and scale references, not copied as mod artwork",
+  "reference_assets": [
+    "0x102b1",
+    "0x101cf"
+  ],
+  "sources": [
+    {
+      "kind": "equipment",
+      "path": "/home/quintine/.codex/generated_images/01a12340-dd1f-71e1-869a-0c9f61a82318/exec-663abae5-23a6-445b-888b-60b823c1c96a.png",
+      "prompt": "Use case: stylized-concept. Asset type: HD sprite for the equipment shop/inventory in a 1990s military science-fiction vertical shooter. Input image is an ORIGINAL STYLE REFERENCE ONLY, not an edit target. Generate a distinct Pulse Cannon: compact twin-barrel gun pod, squat armored gray metal body, restrained cyan capacitor accents and a red service panel. Top-down orthographic overhead view, barrel points exactly UP, no perspective tilt. Isolated single object centered on genuinely transparent 1024x1024 square canvas, silhouette occupying central 70% with at least 12% transparent margin. Style consistent with the reference: readable chunky military silhouette, muted gunmetal highlights, strongest light from upper-left, limited palette. Add restrained machined panel detail for HD view. No text, no labels, no glow outside silhouette, no ground shadow, no frames, no extra objects. Will be displayed at logical 16x16 pixels SD and 64x64 HD. Preserve clear shape when downsampled.",
+      "sha256": "01632fef820816f36ce56936e274c986e95d3be328e907b0a3ca812598265219",
+      "local_path": "art/equipment-generated-source.png"
+    },
+    {
+      "kind": "projectile",
+      "path": "/home/quintine/.codex/generated_images/01a12340-dd1f-71e1-869a-0c9f61a82318/exec-1c5c328f-a363-4b2a-9cf0-300f72806812.png",
+      "prompt": "Use case: stylized-concept. Asset type: isolated projectile sprite for a military science-fiction vertical shooter. Reference image is an ORIGINAL STYLE REFERENCE ONLY for chunky readable projectile pixels. Generate ONE short cyan-blue pulse bolt traveling exactly UP: rectangular bright pale core, stepped blue/cyan outer shell, compact tapered energy tail below. Orthographic straight-on top-down view, clean bounded silhouette, no weapon or spacecraft. Genuine transparent background. Tall narrow silhouette with width:height ratio 2:3, occupying central 65% height of a square canvas with large transparent margins. Restrained crisp pixel-inspired HD detailing matching 1990s Raptor, minimal colors, no expansive glow, no labels, no text, no shadow, no border, no multiple projectiles. Gamelogical canvas8x12 and32x48 HD.",
+      "sha256": "eac18f0856d0c4c75a9aa484a2c368bf70ccb2b7fb4358a603771253eea9ad7d",
+      "local_path": "art/projectile-generated-source.png"
+    }
+  ],
+  "conversion": "prepare_art.rs crops to alpha>=128 silhouette, fits with transparent margins, preserves aspect and reduces to logical SD/4xHD. SD nearest sampling alpha128; HD Lanczos3 alpha64. Pixel values quantized at runtime.",
+  "outputs": {
+    "art/equipment-generated-source.png": {
+      "sha256": "01632fef820816f36ce56936e274c986e95d3be328e907b0a3ca812598265219",
+      "bytes": 595039
+    },
+    "art/equipment-sd.png": {
+      "sha256": "210a81f92cc9463577461df87e0d80f87402e0470837f70f52cca881d11eeaac",
+      "bytes": 615
+    },
+    "art/equipment-hd.png": {
+      "sha256": "ffc12be3d453065fe02c9796b8bae9dc3e23296bd9156b811a8e4b4c9ab1f791",
+      "bytes": 5286
+    },
+    "art/projectile-generated-source.png": {
+      "sha256": "eac18f0856d0c4c75a9aa484a2c368bf70ccb2b7fb4358a603771253eea9ad7d",
+      "bytes": 801668
+    },
+    "art/projectile-sd.png": {
+      "sha256": "ba31c5397043be8e8138e7574c08fdaf351a7e110bf83645b4394242819afc60",
+      "bytes": 240
+    },
+    "art/projectile-hd.png": {
+      "sha256": "a359c389c218189b7a9d07bcd9f53b8a5a1a002fb1175ad80a9ce33c06ad78dc",
+      "bytes": 992
+    }
+  },
+  "sounds": {
+    "audio/fire.wav": {
+      "sha256": "8cc128db1209e04734267e571acb7aef9dd1ba230f71d909eacf6a0ed272b903",
+      "bytes": 5776,
+      "synthesis": "generate_audio.py PCM16 mono22050Hz"
+    },
+    "audio/impact.wav": {
+      "sha256": "d5cbbeddb0fdaadfc89000e86bd01e22cff31766f188eb64fcf96056e23aca2e",
+      "bytes": 7540,
+      "synthesis": "generate_audio.py PCM16 mono22050Hz"
+    }
+  }
+}
diff --git a/examples/mods/pulse_cannon/art/equipment-generated-source.png b/examples/mods/pulse_cannon/art/equipment-generated-source.png
new file mode 100644
index 00000000..7d166801
Binary files /dev/null and b/examples/mods/pulse_cannon/art/equipment-generated-source.png differ
diff --git a/examples/mods/pulse_cannon/art/equipment-hd.png b/examples/mods/pulse_cannon/art/equipment-hd.png
new file mode 100644
index 00000000..44af94d5
Binary files /dev/null and b/examples/mods/pulse_cannon/art/equipment-hd.png differ
diff --git a/examples/mods/pulse_cannon/art/equipment-sd.png b/examples/mods/pulse_cannon/art/equipment-sd.png
new file mode 100644
index 00000000..c2d11f0a
Binary files /dev/null and b/examples/mods/pulse_cannon/art/equipment-sd.png differ
diff --git a/examples/mods/pulse_cannon/art/projectile-generated-source.png b/examples/mods/pulse_cannon/art/projectile-generated-source.png
new file mode 100644
index 00000000..5874cafa
Binary files /dev/null and b/examples/mods/pulse_cannon/art/projectile-generated-source.png differ
diff --git a/examples/mods/pulse_cannon/art/projectile-hd.png b/examples/mods/pulse_cannon/art/projectile-hd.png
new file mode 100644
index 00000000..f847883c
Binary files /dev/null and b/examples/mods/pulse_cannon/art/projectile-hd.png differ
diff --git a/examples/mods/pulse_cannon/art/projectile-sd.png b/examples/mods/pulse_cannon/art/projectile-sd.png
new file mode 100644
index 00000000..41aabb88
Binary files /dev/null and b/examples/mods/pulse_cannon/art/projectile-sd.png differ
diff --git a/examples/mods/pulse_cannon/audio/fire.wav b/examples/mods/pulse_cannon/audio/fire.wav
new file mode 100644
index 00000000..18c5371b
Binary files /dev/null and b/examples/mods/pulse_cannon/audio/fire.wav differ
diff --git a/examples/mods/pulse_cannon/audio/impact.wav b/examples/mods/pulse_cannon/audio/impact.wav
new file mode 100644
index 00000000..16ae071c
Binary files /dev/null and b/examples/mods/pulse_cannon/audio/impact.wav differ
diff --git a/examples/mods/pulse_cannon/content.json b/examples/mods/pulse_cannon/content.json
new file mode 100644
index 00000000..aa320c79
--- /dev/null
+++ b/examples/mods/pulse_cannon/content.json
@@ -0,0 +1,71 @@
+{
+  "weapons": [
+    {
+      "id": "pulse_cannon:projectile",
+      "name": "Pulse Cannon Projectile",
+      "damage": 4,
+      "speed": 8,
+      "cooldown": 9,
+      "behavior": "straight",
+      "target": "all",
+      "offsets": [
+        [
+          -4,
+          -3
+        ],
+        [
+          4,
+          -3
+        ]
+      ],
+      "art": {
+        "png": "art/projectile-sd.png",
+        "hd_png": "art/projectile-hd.png",
+        "logical_width": 8,
+        "logical_height": 12,
+        "nearest": true
+      },
+      "script": "scripts/weapon.rhai"
+    }
+  ],
+  "items": [
+    {
+      "id": "pulse_cannon:equipment",
+      "name": "Pulse Cannon",
+      "price": 6500,
+      "max_count": 1,
+      "initial_count": 1,
+      "weapon": "pulse_cannon:projectile",
+      "special": false,
+      "consumable": false,
+      "art": {
+        "png": "art/equipment-sd.png",
+        "hd_png": "art/equipment-hd.png",
+        "logical_width": 16,
+        "logical_height": 16,
+        "nearest": true
+      },
+      "script": "scripts/equipment.rhai"
+    }
+  ],
+  "sounds": [
+    {
+      "id": "pulse_cannon:fire",
+      "name": "Pulse Cannon Fire",
+      "file": "audio/fire.wav",
+      "volume": 92,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 1
+    },
+    {
+      "id": "pulse_cannon:impact",
+      "name": "Pulse Cannon Impact",
+      "file": "audio/impact.wav",
+      "volume": 78,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    }
+  ]
+}
diff --git a/examples/mods/pulse_cannon/generate_audio.py b/examples/mods/pulse_cannon/generate_audio.py
new file mode 100644
index 00000000..6d40aecf
--- /dev/null
+++ b/examples/mods/pulse_cannon/generate_audio.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+"""Reproduce local procedural weapon audio; WAV outputs are tracked with the package."""
+import math
+import struct
+import wave
+from pathlib import Path
+
+PACKAGE = "pulse_cannon"
+RATE = 22050
+
+def render(kind):
+    duration = 0.13 if kind == "fire" else 0.17
+    count = int(RATE * duration)
+    phase = 0.0
+    seed = 0xA7C51D3
+    samples = []
+    for n in range(count):
+        t = n / count
+        seed ^= (seed << 13) & 0xffffffff
+        seed ^= seed >> 17
+        seed ^= (seed << 5) & 0xffffffff
+        seed &= 0xffffffff
+        noise = (seed / 2147483648.0) - 1.0
+        if PACKAGE == "pulse_cannon":
+            frequency = (1350 * (1 - t) + 190) if kind == "fire" else 130
+            tone = math.sin(phase) * 0.64 + noise * 0.22
+        elif PACKAGE == "seeker_swarm":
+            frequency = 330 + 850 * t if kind == "fire" else 95
+            tone = noise * 0.48 + math.sin(phase) * 0.35
+        else:
+            frequency = 1850 + 680 * t if kind == "fire" else 680 * (1 - t) + 110
+            tone = math.sin(phase) * 0.52 + math.sin(phase * 1.997) * 0.2 + noise * 0.06
+        phase += 2 * math.pi * frequency / RATE
+        attack = min(1.0, n / (RATE * 0.003))
+        envelope = attack * (1 - t) ** (3 if kind == "impact" else 2)
+        samples.append(round(max(-1, min(1, tone * envelope)) * 21000))
+    return struct.pack("<" + "h" * len(samples), *samples)
+
+if __name__ == "__main__":
+    output = Path(__file__).resolve().parent / "audio"
+    output.mkdir(exist_ok=True)
+    for kind in ["fire", "impact"]:
+        with wave.open(str(output / (kind + ".wav")), "wb") as wav:
+            wav.setparams((1, 2, RATE, 0, "NONE", "not compressed"))
+            wav.writeframes(render(kind))
+        print(output / (kind + ".wav"))
diff --git a/examples/mods/pulse_cannon/mod.toml b/examples/mods/pulse_cannon/mod.toml
new file mode 100644
index 00000000..e7befa59
--- /dev/null
+++ b/examples/mods/pulse_cannon/mod.toml
@@ -0,0 +1,7 @@
+id = "pulse_cannon"
+name = "Pulse Cannon"
+version = "1.0.0"
+api_version = 1
+description = "Naval science-fiction pulse cannon: independent weapon, equipment, SD/HD artwork and local firing/impact audio."
+content = "content.json"
+scripts = ["scripts/weapon.rhai", "scripts/equipment.rhai"]
diff --git a/examples/mods/pulse_cannon/prepare_art.rs b/examples/mods/pulse_cannon/prepare_art.rs
new file mode 100644
index 00000000..47b2060e
--- /dev/null
+++ b/examples/mods/pulse_cannon/prepare_art.rs
@@ -0,0 +1,90 @@
+//! Build game-ready logical and HD PNG canvases from the inspected generated sources.
+//! Compile with the project's image dependency, then pass equipment source, shot source.
+use image::{Rgba, RgbaImage, imageops};
+use std::{env, fs, path::Path};
+const PACKAGE: &str = "pulse_cannon";
+const SHOT: (u32, u32) = (8, 12);
+fn canvas(source: &RgbaImage, width: u32, height: u32, hd: bool) -> RgbaImage {
+    // Only the solid silhouette defines its fitting box; faint outer glows stay bounded.
+    let mut bounds = (source.width(), source.height(), 0, 0);
+    for (x, y, p) in source.enumerate_pixels() {
+        if p[3] >= 128 {
+            bounds.0 = bounds.0.min(x);
+            bounds.1 = bounds.1.min(y);
+            bounds.2 = bounds.2.max(x + 1);
+            bounds.3 = bounds.3.max(y + 1);
+        }
+    }
+    assert!(
+        bounds.2 > bounds.0 && bounds.3 > bounds.1,
+        "source has no opaque silhouette"
+    );
+    let cropped = imageops::crop_imm(
+        source,
+        bounds.0,
+        bounds.1,
+        bounds.2 - bounds.0,
+        bounds.3 - bounds.1,
+    )
+    .to_image();
+    let margin = if hd { 4 } else { 1 };
+    let available = (
+        width.saturating_sub(margin * 2).max(1),
+        height.saturating_sub(margin * 2).max(1),
+    );
+    let factor = (available.0 as f64 / cropped.width() as f64)
+        .min(available.1 as f64 / cropped.height() as f64);
+    let size = (
+        (cropped.width() as f64 * factor).round().max(1.) as u32,
+        (cropped.height() as f64 * factor).round().max(1.) as u32,
+    );
+    let filter = if hd {
+        imageops::FilterType::Lanczos3
+    } else {
+        imageops::FilterType::Nearest
+    };
+    let mut scaled = imageops::resize(&cropped, size.0, size.1, filter);
+    for p in scaled.pixels_mut() {
+        if p[3] < (if hd { 64 } else { 128 }) {
+            *p = Rgba([0, 0, 0, 0]);
+        } else {
+            p[3] = 255;
+        }
+    }
+    let mut out = RgbaImage::new(width, height);
+    imageops::overlay(
+        &mut out,
+        &scaled,
+        ((width - size.0) / 2) as i64,
+        ((height - size.1) / 2) as i64,
+    );
+    out
+}
+fn main() {
+    let args: Vec<_> = env::args_os().collect();
+    assert_eq!(
+        args.len(),
+        4,
+        "usage: prepare_art EQUIPMENT_SOURCE SHOT_SOURCE PACKAGE_DIRECTORY"
+    );
+    let output = Path::new(&args[3]).join("art");
+    fs::create_dir_all(&output).unwrap();
+    for (kind, path, logical) in [
+        ("equipment", &args[1], (16, 16)),
+        ("projectile", &args[2], SHOT),
+    ] {
+        let source = image::open(path).unwrap().into_rgba8();
+        fs::copy(path, output.join(format!("{kind}-generated-source.png"))).unwrap();
+        for (mode, scale) in [("sd", 1), ("hd", 4)] {
+            let image = canvas(&source, logical.0 * scale, logical.1 * scale, scale == 4);
+            let path = output.join(format!("{kind}-{mode}.png"));
+            image.save(&path).unwrap();
+            println!(
+                "{PACKAGE}: {}×{} {}",
+                image.width(),
+                image.height(),
+                path.display()
+            );
+        }
+    }
+}
diff --git a/examples/mods/pulse_cannon/scripts/equipment.rhai b/examples/mods/pulse_cannon/scripts/equipment.rhai
new file mode 100644
index 00000000..1125e095
--- /dev/null
+++ b/examples/mods/pulse_cannon/scripts/equipment.rhai
@@ -0,0 +1,6 @@
+// Recovery is recorded separately from the weapon firing state.
+fn on_pickup(event, state, random) {
+    let recovered = if state.contains("recovered") { state.recovered % 100000 + 1 } else { 1 };
+    #{ commands: [#{ op: "objective", key: "pulse_cannon:recovered", value: recovered }],
+       state: #{ recovered: recovered } }
+}
diff --git a/examples/mods/pulse_cannon/scripts/weapon.rhai b/examples/mods/pulse_cannon/scripts/weapon.rhai
new file mode 100644
index 00000000..f6927794
--- /dev/null
+++ b/examples/mods/pulse_cannon/scripts/weapon.rhai
@@ -0,0 +1,28 @@
+// Built-in straight projectiles handle the normal volley and collision rules.
+// Callbacks add deterministic visuals, audio and serializable weapon counters.
+fn on_fire(event, state, random) {
+    let bursts = if state.contains("bursts") { state.bursts % 100000 + 1 } else { 1 };
+    let hits = if state.contains("hits") { state.hits } else { 0 };
+    let commands = [
+        #{ op: "play_sound", sound: "pulse_cannon:fire" },
+#{ op: "effect", x: event.x, y: event.y - 3 }
+    ];
+
+    // Every third burst adds a deterministic pair of shallow angled pulses.
+    if bursts % 3 == 0 {
+        let spread = 1 + random[0] % 2;
+        commands.push(#{ op: "projectile", weapon: "pulse_cannon:projectile", x: event.x - 8, y: event.y - 3, vx: -spread, vy: -8 });
+        commands.push(#{ op: "projectile", weapon: "pulse_cannon:projectile", x: event.x + 8, y: event.y - 3, vx: spread, vy: -8 });
+    }
+    #{ commands: commands, state: #{ bursts: bursts, hits: hits } }
+}
+
+fn on_hit(event, state, random) {
+    let bursts = if state.contains("bursts") { state.bursts } else { 0 };
+    let hits = if state.contains("hits") { state.hits % 100000 + 1 } else { 1 };
+    let commands = [
+        #{ op: "play_sound", sound: "pulse_cannon:impact" },
+        #{ op: "effect", x: event.x, y: event.y }
+    ];
+    #{ commands: commands, state: #{ bursts: bursts, hits: hits } }
+}
diff --git a/examples/mods/seeker_swarm/ART_PROVENANCE.md b/examples/mods/seeker_swarm/ART_PROVENANCE.md
new file mode 100644
index 00000000..eeda7c87
--- /dev/null
+++ b/examples/mods/seeker_swarm/ART_PROVENANCE.md
@@ -0,0 +1,7 @@
+# seeker_swarm artwork provenance
+
+Generated locally with the built-in image generation tool and the imagegen skill. Original catalog IDs `0x102b1` (gray gun inventory icon) and `0x101cf` (8×8 projectile) were decoded and inspected as style/scale references. Original pixels are not included in the mod or Git. The prompt uses these references to create a distinct naval industrial weapon rather than copy the original.
+
+Generated master images, SD/HD sprites and sound WAVs are tracked with the package, as requested. Original game pixels and decoded reference images remain outside Git. The generated source is converted into 16×16/64×64 equipment canvases and a 8×16 logical projectile canvas plus its 4× HD counterpart. Transparent margins remain inside the logical canvas. Sound synthesis is deterministic, PCM16 mono 22,050 Hz; `generate_audio.py` is the complete reproduction source.
+
+Prompts and generated-source SHA256 hashes are recorded in `art-provenance.json` after output verification. Palette conversion occurs in the runtime loader; gameplay dimensions do not depend on HD artwork.
diff --git a/examples/mods/seeker_swarm/README.md b/examples/mods/seeker_swarm/README.md
new file mode 100644
index 00000000..0060c8bb
--- /dev/null
+++ b/examples/mods/seeker_swarm/README.md
@@ -0,0 +1,9 @@
+# Seeker Swarm 1.0.0
+
+Enable **Seeker Swarm** in Mods and apply at the main menu. This independent API 1 example has no dependencies. Buy its equipment in the shop (14,000 credits, maximum one) or collect its pickup. Choose it in Inventory or cycle special weapons during a mission. The equipped weapon fires with Fire or Special; it consumes no ammunition.
+
+Projectile: 6 damage, 6 logical pixels per step, 18 step cooldown, `homing`, air and ground targets. Three homing missiles fire together; an impact deals two fragmentation damage to up to two nearby enemies. Rhai stores bounded burst/hit counters and emits local firing/impact sounds and effects.
+
+`art/equipment-sd.png` is a 16×16 logical icon, `art/equipment-hd.png` its detailed 4× variant. Projectile canvases are 8×16 SD and 32×64 HD. Switch HD artwork in Options. The generated master images, SD/HD sprites, WAV files, provenance and reproduction inputs are tracked in Git. Original game assets and decoded reference images remain outside version control. `python3 generate_audio.py` reproduces both sound files.
+
+Validate locally with `cargo run --no-default-features -- --mods examples/mods --validate-mods seeker_swarm`. Read the shared [API documentation](../../../docs/modding-api.md) for save pins, dependencies and sandbox limits.
diff --git a/examples/mods/seeker_swarm/art-provenance.json b/examples/mods/seeker_swarm/art-provenance.json
new file mode 100644
index 00000000..4c3a89f4
--- /dev/null
+++ b/examples/mods/seeker_swarm/art-provenance.json
@@ -0,0 +1,65 @@
+{
+  "package": "seeker_swarm",
+  "tool": "built-in image_gen",
+  "skill": "/home/quintine/.codex/skills/.system/imagegen/SKILL.md",
+  "reference_role": "Original catalog sprites inspected as style and scale references, not copied as mod artwork",
+  "reference_assets": [
+    "0x102b1",
+    "0x101cf"
+  ],
+  "sources": [
+    {
+      "kind": "equipment",
+      "path": "/home/quintine/.codex/generated_images/01a12340-dd1f-71e1-869a-0c9f61a82318/exec-a0a127b8-67e8-43f2-a080-cbfefceac7b2.png",
+      "prompt": "Use case: stylized-concept. Asset type: HD sprite for equipment shop/inventory in 1990s military science-fiction vertical shooter. Input image is an ORIGINAL STYLE REFERENCE ONLY, not an edit target. Generate a distinct Seeker Swarm launcher: compact gray armored missile pod with three narrow rocket tips pointing exactly UP, dark launch channels, restrained amber indicator dots and red service tab. Top-down orthographic overhead view, symmetrical compact military silhouette. Isolated single object centered on genuinely transparent 1024x1024 square canvas, silhouette central 70%, at least 12% transparent margin. Reference style: chunky readable silhouette, muted gunmetal, upper-left highlights, limited palette. Restrained machined detail appropriate HD. No text, labels, glow, shadows outside body, border, frame, extra objects. Display logical 16x16 SD and64x64 HD; make silhouette readable after reduction.",
+      "sha256": "29336ba6ae08bdb8c42feb257c6a7f9d05c174fa10643674602d1bd6c86797ff",
+      "local_path": "art/equipment-generated-source.png"
+    },
+    {
+      "kind": "projectile",
+      "path": "/home/quintine/.codex/generated_images/01a12340-dd1f-71e1-869a-0c9f61a82318/exec-defa402a-c1f2-4a56-923e-98d8b64f081e.png",
+      "prompt": "Use case: stylized-concept. Asset type: ONE isolated homing missile projectile sprite for a military science-fiction vertical shooter. Reference image is original STYLE reference for chunky readability ONLY. Generate a small slender naval gray missile pointing EXACTLY UP, white metal pointed nose, gray body with a narrow red band, two small fins, short amber engine exhaust directly below. Top-down orthographic overhead view, centered symmetric military silhouette. Genuine transparent square canvas with large margins; missile silhouette width:height1:2 and occupies central70%height. Palette gray slate white amber red, strongest light upper-left, crisp readable pixel-inspired HD detail. No spacecraft, no launcher, no multiplemissiles, no expansiveglow, no shadow, no text/labels/border. Logicalcanvas8x16 and32x64HD.",
+      "sha256": "59ed9ff1c0302955ff6d047c9527ba3f2c9c2ff15c5a9c07ebb86fc08887cf14",
+      "local_path": "art/projectile-generated-source.png"
+    }
+  ],
+  "conversion": "prepare_art.rs crops to alpha>=128 silhouette, fits with transparent margins, preserves aspect and reduces to logical SD/4xHD. SD nearest sampling alpha128; HD Lanczos3 alpha64. Pixel values quantized at runtime.",
+  "outputs": {
+    "art/equipment-generated-source.png": {
+      "sha256": "29336ba6ae08bdb8c42feb257c6a7f9d05c174fa10643674602d1bd6c86797ff",
+      "bytes": 528586
+    },
+    "art/equipment-sd.png": {
+      "sha256": "8b7d5dc945536f8b35b38bc37c4f607fbba7bb6da4cc00691c18576a72224764",
+      "bytes": 643
+    },
+    "art/equipment-hd.png": {
+      "sha256": "caeca8f6e4993dcbb6047974caf8dae442d2abe2043b516685602cece6f970df",
+      "bytes": 6002
+    },
+    "art/projectile-generated-source.png": {
+      "sha256": "59ed9ff1c0302955ff6d047c9527ba3f2c9c2ff15c5a9c07ebb86fc08887cf14",
+      "bytes": 256643
+    },
+    "art/projectile-sd.png": {
+      "sha256": "c382c66203efd29ef467951ae9213d95e24d760837e51221d2ec9addb519125c",
+      "bytes": 246
+    },
+    "art/projectile-hd.png": {
+      "sha256": "dc9ee59e6c461fba0373c842af4c12c8f25a1ed4b21eecb214888de7914f9d09",
+      "bytes": 1426
+    }
+  },
+  "sounds": {
+    "audio/fire.wav": {
+      "sha256": "08fc2bb9b9054954f9bc8fe378e6d3aaa26081f3eae172f4f3fa14c580b4c20a",
+      "bytes": 5776,
+      "synthesis": "generate_audio.py PCM16 mono22050Hz"
+    },
+    "audio/impact.wav": {
+      "sha256": "c32ab425f9e4be45a0921657cf76c845d1f9c432cd2bf64e6aa16be725c2c882",
+      "bytes": 7540,
+      "synthesis": "generate_audio.py PCM16 mono22050Hz"
+    }
+  }
+}
diff --git a/examples/mods/seeker_swarm/art/equipment-generated-source.png b/examples/mods/seeker_swarm/art/equipment-generated-source.png
new file mode 100644
index 00000000..6d31ee67
Binary files /dev/null and b/examples/mods/seeker_swarm/art/equipment-generated-source.png differ
diff --git a/examples/mods/seeker_swarm/art/equipment-hd.png b/examples/mods/seeker_swarm/art/equipment-hd.png
new file mode 100644
index 00000000..1210bec7
Binary files /dev/null and b/examples/mods/seeker_swarm/art/equipment-hd.png differ
diff --git a/examples/mods/seeker_swarm/art/equipment-sd.png b/examples/mods/seeker_swarm/art/equipment-sd.png
new file mode 100644
index 00000000..c0b75b9d
Binary files /dev/null and b/examples/mods/seeker_swarm/art/equipment-sd.png differ
diff --git a/examples/mods/seeker_swarm/art/projectile-generated-source.png b/examples/mods/seeker_swarm/art/projectile-generated-source.png
new file mode 100644
index 00000000..43447230
Binary files /dev/null and b/examples/mods/seeker_swarm/art/projectile-generated-source.png differ
diff --git a/examples/mods/seeker_swarm/art/projectile-hd.png b/examples/mods/seeker_swarm/art/projectile-hd.png
new file mode 100644
index 00000000..28da9b2a
Binary files /dev/null and b/examples/mods/seeker_swarm/art/projectile-hd.png differ
diff --git a/examples/mods/seeker_swarm/art/projectile-sd.png b/examples/mods/seeker_swarm/art/projectile-sd.png
new file mode 100644
index 00000000..10c11a10
Binary files /dev/null and b/examples/mods/seeker_swarm/art/projectile-sd.png differ
diff --git a/examples/mods/seeker_swarm/audio/fire.wav b/examples/mods/seeker_swarm/audio/fire.wav
new file mode 100644
index 00000000..c7a6e676
Binary files /dev/null and b/examples/mods/seeker_swarm/audio/fire.wav differ
diff --git a/examples/mods/seeker_swarm/audio/impact.wav b/examples/mods/seeker_swarm/audio/impact.wav
new file mode 100644
index 00000000..d75a20ac
Binary files /dev/null and b/examples/mods/seeker_swarm/audio/impact.wav differ
diff --git a/examples/mods/seeker_swarm/content.json b/examples/mods/seeker_swarm/content.json
new file mode 100644
index 00000000..0f1fce81
--- /dev/null
+++ b/examples/mods/seeker_swarm/content.json
@@ -0,0 +1,75 @@
+{
+  "weapons": [
+    {
+      "id": "seeker_swarm:projectile",
+      "name": "Seeker Swarm Projectile",
+      "damage": 6,
+      "speed": 6,
+      "cooldown": 18,
+      "behavior": "homing",
+      "target": "all",
+      "offsets": [
+        [
+          -7,
+          -2
+        ],
+        [
+          0,
+          -5
+        ],
+        [
+          7,
+          -2
+        ]
+      ],
+      "art": {
+        "png": "art/projectile-sd.png",
+        "hd_png": "art/projectile-hd.png",
+        "logical_width": 8,
+        "logical_height": 16,
+        "nearest": true
+      },
+      "script": "scripts/weapon.rhai"
+    }
+  ],
+  "items": [
+    {
+      "id": "seeker_swarm:equipment",
+      "name": "Seeker Swarm",
+      "price": 14000,
+      "max_count": 1,
+      "initial_count": 1,
+      "weapon": "seeker_swarm:projectile",
+      "special": true,
+      "consumable": false,
+      "art": {
+        "png": "art/equipment-sd.png",
+        "hd_png": "art/equipment-hd.png",
+        "logical_width": 16,
+        "logical_height": 16,
+        "nearest": true
+      },
+      "script": "scripts/equipment.rhai"
+    }
+  ],
+  "sounds": [
+    {
+      "id": "seeker_swarm:fire",
+      "name": "Seeker Swarm Fire",
+      "file": "audio/fire.wav",
+      "volume": 92,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 1
+    },
+    {
+      "id": "seeker_swarm:impact",
+      "name": "Seeker Swarm Impact",
+      "file": "audio/impact.wav",
+      "volume": 78,
+      "pan": 127,
+      "pitch": 128,
+      "priority": 2
+    }
+  ]
+}
diff --git a/examples/mods/seeker_swarm/generate_audio.py b/examples/mods/seeker_swarm/generate_audio.py
new file mode 100644
index 00000000..7ab6dca7
--- /dev/null
+++ b/examples/mods/seeker_swarm/generate_audio.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+"""Reproduce local procedural weapon audio; WAV outputs are tracked with the package."""
+import math
+import struct
+import wave
+from pathlib import Path
+
+PACKAGE = "seeker_swarm"
+RATE = 22050
+
+def render(kind):
+    duration = 0.13 if kind == "fire" else 0.17
+    count = int(RATE * duration)
+    phase = 0.0
+    seed = 0xA7C51D3
+    samples = []
+    for n in range(count):
+        t = n / count
+        seed ^= (seed << 13) & 0xffffffff
+        seed ^= seed >> 17
+        seed ^= (seed << 5) & 0xffffffff
+        seed &= 0xffffffff
+        noise = (seed / 2147483648.0) - 1.0
+        if PACKAGE == "pulse_cannon":
+            frequency = (1350 * (1 - t) + 190) if kind == "fire" else 130
+            tone = math.sin(phase) * 0.64 + noise * 0.22
+        elif PACKAGE == "seeker_swarm":
+            frequency = 330 + 850 * t if kind == "fire" else 95
+            tone = noise * 0.48 + math.sin(phase) * 0.35
+        else:
+            frequency = 1850 + 680 * t if kind == "fire" else 680 * (1 - t) + 110
+            tone = math.sin(phase) * 0.52 + math.sin(phase * 1.997) * 0.2 + noise * 0.06
+        phase += 2 * math.pi * frequency / RATE
+        attack = min(1.0, n / (RATE * 0.003))
+        envelope = attack * (1 - t) ** (3 if kind == "impact" else 2)
+        samples.append(round(max(-1, min(1, tone * envelope)) * 21000))
+    return struct.pack("<" + "h" * len(samples), *samples)
+
+if __name__ == "__main__":
+    output = Path(__file__).resolve().parent / "audio"
+    output.mkdir(exist_ok=True)
+    for kind in ["fire", "impact"]:
+        with wave.open(str(output / (kind + ".wav")), "wb") as wav:
+            wav.setparams((1, 2, RATE, 0, "NONE", "not compressed"))
+            wav.writeframes(render(kind))
+        print(output / (kind + ".wav"))
diff --git a/examples/mods/seeker_swarm/mod.toml b/examples/mods/seeker_swarm/mod.toml
new file mode 100644
index 00000000..8327cee5
--- /dev/null
+++ b/examples/mods/seeker_swarm/mod.toml
@@ -0,0 +1,7 @@
+id = "seeker_swarm"
+name = "Seeker Swarm"
+version = "1.0.0"
+api_version = 1
+description = "Naval science-fiction seeker swarm: independent weapon, equipment, SD/HD artwork and local firing/impact audio."
+content = "content.json"
+scripts = ["scripts/weapon.rhai", "scripts/equipment.rhai"]
diff --git a/examples/mods/seeker_swarm/prepare_art.rs b/examples/mods/seeker_swarm/prepare_art.rs
new file mode 100644
index 00000000..26a0a1db
--- /dev/null
+++ b/examples/mods/seeker_swarm/prepare_art.rs
@@ -0,0 +1,90 @@
+//! Build game-ready logical and HD PNG canvases from the inspected generated sources.
+//! Compile with the project's image dependency, then pass equipment source, shot source.
+use image::{Rgba, RgbaImage, imageops};
+use std::{env, fs, path::Path};
+const PACKAGE: &str = "seeker_swarm";
+const SHOT: (u32, u32) = (8, 16);
+fn canvas(source: &RgbaImage, width: u32, height: u32, hd: bool) -> RgbaImage {
+    // Only the solid silhouette defines its fitting box; faint outer glows stay bounded.
+    let mut bounds = (source.width(), source.height(), 0, 0);
+    for (x, y, p) in source.enumerate_pixels() {
+        if p[3] >= 128 {
+            bounds.0 = bounds.0.min(x);
+            bounds.1 = bounds.1.min(y);
+            bounds.2 = bounds.2.max(x + 1);
+            bounds.3 = bounds.3.max(y + 1);
+        }
+    }
+    assert!(
+        bounds.2 > bounds.0 && bounds.3 > bounds.1,
+        "source has no opaque silhouette"
+    );
+    let cropped = imageops::crop_imm(
+        source,
+        bounds.0,
+        bounds.1,
+        bounds.2 - bounds.0,
+        bounds.3 - bounds.1,
+    )
+    .to_image();
+    let margin = if hd { 4 } else { 1 };
+    let available = (
+        width.saturating_sub(margin * 2).max(1),
+        height.saturating_sub(margin * 2).max(1),
+    );
+    let factor = (available.0 as f64 / cropped.width() as f64)
+        .min(available.1 as f64 / cropped.height() as f64);
+    let size = (
+        (cropped.width() as f64 * factor).round().max(1.) as u32,
+        (cropped.height() as f64 * factor).round().max(1.) as u32,
+    );
+    let filter = if hd {
+        imageops::FilterType::Lanczos3
+    } else {
+        imageops::FilterType::Nearest
+    };
+    let mut scaled = imageops::resize(&cropped, size.0, size.1, filter);
+    for p in scaled.pixels_mut() {
+        if p[3] < (if hd { 64 } else { 128 }) {
+            *p = Rgba([0, 0, 0, 0]);
+        } else {
+            p[3] = 255;
+        }
+    }
+    let mut out = RgbaImage::new(width, height);
+    imageops::overlay(
+        &mut out,
+        &scaled,
+        ((width - size.0) / 2) as i64,
+        ((height - size.1) / 2) as i64,
+    );
+    out
+}
+fn main() {
+    let args: Vec<_> = env::args_os().collect();
+    assert_eq!(
+        args.len(),
+        4,
+        "usage: prepare_art EQUIPMENT_SOURCE SHOT_SOURCE PACKAGE_DIRECTORY"
+    );
+    let output = Path::new(&args[3]).join("art");
+    fs::create_dir_all(&output).unwrap();
+    for (kind, path, logical) in [
+        ("equipment", &args[1], (16, 16)),
+        ("projectile", &args[2], SHOT),
+    ] {
+        let source = image::open(path).unwrap().into_rgba8();
+        fs::copy(path, output.join(format!("{kind}-generated-source.png"))).unwrap();
+        for (mode, scale) in [("sd", 1), ("hd", 4)] {
+            let image = canvas(&source, logical.0 * scale, logical.1 * scale, scale == 4);
+            let path = output.join(format!("{kind}-{mode}.png"));
+            image.save(&path).unwrap();
+            println!(
+                "{PACKAGE}: {}×{} {}",
+                image.width(),
+                image.height(),
+                path.display()
+            );
+        }
+    }
+}
diff --git a/examples/mods/seeker_swarm/scripts/equipment.rhai b/examples/mods/seeker_swarm/scripts/equipment.rhai
new file mode 100644
index 00000000..c157cfdb
--- /dev/null
+++ b/examples/mods/seeker_swarm/scripts/equipment.rhai
@@ -0,0 +1,6 @@
+// Recovery is recorded separately from the weapon firing state.
+fn on_pickup(event, state, random) {
+    let recovered = if state.contains("recovered") { state.recovered % 100000 + 1 } else { 1 };
+    #{ commands: [#{ op: "objective", key: "seeker_swarm:recovered", value: recovered }],
+       state: #{ recovered: recovered } }
+}
diff --git a/examples/mods/seeker_swarm/scripts/weapon.rhai b/examples/mods/seeker_swarm/scripts/weapon.rhai
new file mode 100644
index 00000000..781239a9
--- /dev/null
+++ b/examples/mods/seeker_swarm/scripts/weapon.rhai
@@ -0,0 +1,32 @@
+// Built-in homing projectiles handle the normal volley and collision rules.
+// Callbacks add deterministic visuals, audio and serializable weapon counters.
+fn on_fire(event, state, random) {
+    let bursts = if state.contains("bursts") { state.bursts % 100000 + 1 } else { 1 };
+    let hits = if state.contains("hits") { state.hits } else { 0 };
+    let commands = [
+        #{ op: "play_sound", sound: "seeker_swarm:fire" },
+#{ op: "effect", x: event.x, y: event.y - 3 }
+    ];
+    #{ commands: commands, state: #{ bursts: bursts, hits: hits } }
+}
+
+fn on_hit(event, state, random) {
+    let bursts = if state.contains("bursts") { state.bursts } else { 0 };
+    let hits = if state.contains("hits") { state.hits % 100000 + 1 } else { 1 };
+    let commands = [
+        #{ op: "play_sound", sound: "seeker_swarm:impact" },
+        #{ op: "effect", x: event.x, y: event.y }
+    ];
+
+    // A small fragmentation charge affects at most two nearby surviving enemies.
+    let fragments = 0;
+    for enemy in event.entities {
+        if fragments < 2 && enemy.entity != event.entity && enemy.health > 0
+            && abs(enemy.x + enemy.width / 2 - event.x) <= 18
+            && abs(enemy.y + enemy.height / 2 - event.y) <= 18 {
+            commands.push(#{ op: "damage", entity: enemy.entity, amount: 2 });
+            fragments += 1;
+        }
+    }
+    #{ commands: commands, state: #{ bursts: bursts, hits: hits } }
+}
diff --git a/tests/enemies_mods.rs b/tests/enemies_mods.rs
new file mode 100644
index 00000000..03f913e2
--- /dev/null
+++ b/tests/enemies_mods.rs
@@ -0,0 +1,452 @@
+//! Enemy package tests use synthetic PNG/WAV fixtures, never original/generated art.
+use raptor_replica::{
+    content::{ContentId, ContentPack, Registry},
+    modding::{self, ActiveMods, Command},
+    persistence::Pilot,
+    simulation::{Input, Outcome, World},
+};
+use serde_json::json;
+use std::{fs, path::Path};
+
+const ENEMIES: [&str; 3] = ["iron_coast_scout", "iron_coast_turret", "iron_coast_boss"];
+
+fn base() -> Registry {
+    let mut registry = Registry::default();
+    let pack: ContentPack = serde_json::from_value(json!({
+        "weapons": [{"id":"base:projectile_forward_guns", "name":"Forward Guns",
+            "damage":1,"speed":8,"cooldown":2,"behavior":"straight","target":"all",
+            "offsets":[[-8,0],[8,0]]}],
+        "items":[{"id":"base:forward_guns","name":"Forward Guns","price":0,
+            "weapon":"base:projectile_forward_guns"},
+            {"id":"base:energy","name":"Shield","price":0,"max_count":100}],
+        "missions":[{"id":"base:sector_1_wave_1","name":"Synthetic Range","duration":5000}]
+    }))
+    .unwrap();
+    registry.apply(pack, "base").unwrap();
+    registry.validate().unwrap();
+    registry
+}
+
+fn wav() -> Vec<u8> {
+    let mut data = b"RIFF".to_vec();
+    data.extend(40_u32.to_le_bytes());
+    data.extend(b"WAVEfmt ");
+    data.extend(16_u32.to_le_bytes());
+    data.extend(1_u16.to_le_bytes());
+    data.extend(1_u16.to_le_bytes());
+    data.extend(22050_u32.to_le_bytes());
+    data.extend(44100_u32.to_le_bytes());
+    data.extend(2_u16.to_le_bytes());
+    data.extend(16_u16.to_le_bytes());
+    data.extend(b"data");
+    data.extend(4_u32.to_le_bytes());
+    data.extend([0, 0, 0, 0]);
+    data
+}
+
+fn install_fixture(root: &Path, id: &str) {
+    let source = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .join("examples/mods")
+        .join(id);
+    let output = root.join(id);
+    fs::create_dir_all(output.join("scripts")).unwrap();
+    fs::create_dir_all(output.join("art")).unwrap();
+    fs::create_dir_all(output.join("audio")).unwrap();
+    for name in ["mod.toml", "content.json", "scripts/ai.rhai"] {
+        fs::copy(source.join(name), output.join(name)).unwrap();
+    }
+    let content: ContentPack =
+        serde_json::from_slice(&fs::read(source.join("content.json")).unwrap()).unwrap();
+    for art in content
+        .enemies
+        .iter()
+        .filter_map(|e| e.art.as_ref())
+        .chain(content.weapons.iter().filter_map(|w| w.art.as_ref()))
+    {
+        for (path, scale) in [
+            (art.png.as_ref().unwrap(), 1),
+            (art.hd_png.as_ref().unwrap(), 2),
+        ] {
+            let mut image = image::RgbaImage::new(
+                art.logical_width * art.frames * scale,
+                art.logical_height * scale,
+            );
+            for frame in 0..art.frames {
+                for y in scale..(art.logical_height - 1) * scale {
+                    for x in scale..(art.logical_width - 1) * scale {
+                        image.put_pixel(
+                            frame * art.logical_width * scale + x,
+                            y,
+                            image::Rgba([80, 90, 100, 255]),
+                        );
+                    }
+                }
+            }
+            image.save(output.join(path)).unwrap();
+        }
+    }
+    for sound in content.sounds {
+        fs::write(output.join(sound.file), wav()).unwrap();
+    }
+}
+
+fn active(ids: &[&str]) -> (tempfile::TempDir, ActiveMods) {
+    let temp = tempfile::tempdir().unwrap();
+    for id in ids {
+        install_fixture(temp.path(), id);
+    }
+    let discovered = modding::discover(temp.path());
+    assert!(discovered.errors.is_empty(), "{:?}", discovered.errors);
+    let selected: Vec<String> = ids.iter().map(|id| id.to_string()).collect();
+    let active = ActiveMods::build(&base(), &discovered, &selected, None).unwrap();
+    (temp, active)
+}
+
+fn world(active: &ActiveMods) -> World {
+    World::new(
+        &ContentId::from("base:sector_1_wave_1"),
+        &Pilot::default(),
+        &active.registry,
+    )
+    .unwrap()
+}
+
+#[test]
+fn all_enemy_packages_validate_independently_and_together() {
+    for id in ENEMIES {
+        let (_temp, a) = active(&[id]);
+        assert_eq!(a.pins.len(), 1);
+        assert_eq!(a.registry.enemies.len(), 1);
+        assert!(
+            a.registry
+                .weapons
+                .contains_key(&ContentId::new(format!("{id}:projectile")).unwrap())
+        );
+        assert_eq!(a.registry.sounds.len(), 2);
+        assert_eq!(
+            a.registry.enemies[&ContentId::new(format!("{id}:unit")).unwrap()]
+                .script
+                .as_deref(),
+            Some("scripts/ai.rhai")
+        );
+    }
+    let (_temp, a) = active(&ENEMIES);
+    assert_eq!(a.pins.len(), 3);
+    assert_eq!(a.registry.enemies.len(), 3);
+    assert!(a.registry.overrides.is_empty());
+}
+
+#[test]
+fn scout_weaves_in_both_directions_and_aims_hostile_fire() {
+    let (_temp, mut a) = active(&["iron_coast_scout"]);
+    let mut w = world(&a);
+    w.player.x = 0;
+    w.spawn(
+        &ContentId::from("iron_coast_scout:unit"),
+        120,
+        0,
+        &a.registry,
+    )
+    .unwrap();
+    let mut right = false;
+    let mut left = false;
+    let mut sounds = 0;
+    for _ in 0..95 {
+        w.step(Input::default(), &a.registry, &mut a.scripts)
+            .unwrap();
+        let e = &w.enemies[0];
+        right |= e.vx > 0;
+        left |= e.vx < 0;
+        assert!(e.x >= 24 && e.x <= 272);
+        assert_eq!(e.vy, 1);
+        sounds += w
+            .mod_sounds
+            .iter()
+            .filter(|id| id.0 == "iron_coast_scout:shot")
+            .count();
+    }
+    assert!(right && left);
+    assert_eq!(w.enemies[0].y, 94);
+    assert!(sounds >= 2);
+    assert!(
+        w.projectiles
+            .iter()
+            .any(|p| p.hostile && p.weapon.0 == "iron_coast_scout:projectile" && p.vx < 0)
+    );
+}
+
+#[test]
+fn turret_scrolls_with_terrain_and_aims_at_player() {
+    let (_temp, mut a) = active(&["iron_coast_turret"]);
+    let mut w = world(&a);
+    w.player.x = 0;
+    w.spawn(
+        &ContentId::from("iron_coast_turret:unit"),
+        220,
+        0,
+        &a.registry,
+    )
+    .unwrap();
+    let mut sounds = 0;
+    for _ in 0..80 {
+        w.step(Input::default(), &a.registry, &mut a.scripts)
+            .unwrap();
+        sounds += w
+            .mod_sounds
+            .iter()
+            .filter(|id| id.0 == "iron_coast_turret:shot")
+            .count();
+    }
+    assert_eq!((w.enemies[0].x, w.enemies[0].y), (220, 80));
+    assert!(a.registry.enemies[&w.enemies[0].definition].ground);
+    assert_eq!(sounds, 2);
+    assert!(
+        w.projectiles
+            .iter()
+            .any(|p| p.hostile && p.vx < 0 && p.vy >= 0)
+    );
+}
+
+#[test]
+fn boss_enters_patrols_fires_fans_and_remains_on_screen() {
+    let (_temp, mut a) = active(&["iron_coast_boss"]);
+    let mut w = world(&a);
+    w.player.x = 0;
+    w.spawn(
+        &ContentId::from("iron_coast_boss:unit"),
+        112,
+        -64,
+        &a.registry,
+    )
+    .unwrap();
+    let mut left = false;
+    let mut right = false;
+    let mut fans = 0;
+    for tick in 0..1500 {
+        w.step(Input::default(), &a.registry, &mut a.scripts)
+            .unwrap();
+        assert_eq!(w.outcome, Outcome::Playing);
+        assert_eq!(w.enemies.len(), 1, "boss retired at{tick}");
+        let e = &w.enemies[0];
+        assert_eq!((e.width, e.height), (96, 64));
+        if tick > 46 {
+            assert_eq!(e.y, 24);
+            assert!((80..=144).contains(&e.x));
+            left |= e.vx < 0;
+            right |= e.vx > 0;
+        }
+        if w.mod_sounds
+            .contains(&ContentId::from("iron_coast_boss:shot"))
+        {
+            let bullets: Vec<_> = w
+                .projectiles
+                .iter()
+                .filter(|p| p.age == 0 && p.hostile)
+                .collect();
+            assert_eq!(bullets.len(), 3);
+            assert_eq!(bullets.iter().map(|p| p.vx).collect::<Vec<_>>(), [-2, 0, 2]);
+            fans += 1;
+        }
+    }
+    assert!(left && right);
+    assert!(fans >= 25);
+}
+
+#[test]
+fn boss_can_be_defeated_with_starter_guns_without_healing() {
+    let (_temp, mut a) = active(&["iron_coast_boss"]);
+    let mut w = world(&a);
+    w.player.x = 128;
+    w.spawn(
+        &ContentId::from("iron_coast_boss:unit"),
+        112,
+        -64,
+        &a.registry,
+    )
+    .unwrap();
+    let mut defeated_at = None;
+    for tick in 0..600 {
+        w.step(
+            Input {
+                fire: true,
+                ..Input::default()
+            },
+            &a.registry,
+            &mut a.scripts,
+        )
+        .unwrap();
+        if w.objectives.get("iron_coast_boss:defeated") == Some(&1) {
+            defeated_at = Some(tick);
+            break;
+        }
+        assert_eq!(w.outcome, Outcome::Playing, "starter pilot died at{tick}");
+    }
+    assert!(
+        defeated_at.is_some(),
+        "boss cannot be killed with starter guns"
+    );
+    assert!(w.enemies.is_empty());
+    assert!(w.player.shield > 0);
+    assert_eq!(w.player.credits, 1800);
+    assert!(
+        w.mod_sounds
+            .contains(&ContentId::from("iron_coast_boss:death"))
+    );
+}
+
+#[test]
+fn death_rewards_objectives_and_sounds_are_emitted_exactly_once() {
+    let (_temp, mut a) = active(&ENEMIES);
+    let mut w = world(&a);
+    for (index, id) in ENEMIES.iter().enumerate() {
+        let unit = ContentId::new(format!("{id}:unit")).unwrap();
+        let entity = w
+            .spawn(&unit, 30 + index as i32 * 100, 0, &a.registry)
+            .unwrap();
+        w.apply_commands(
+            &[Command::Damage {
+                entity,
+                amount: 100000,
+            }],
+            &a.registry,
+        )
+        .unwrap();
+    }
+    w.step(Input::default(), &a.registry, &mut a.scripts)
+        .unwrap();
+    assert!(w.enemies.is_empty());
+    assert_eq!(w.player.credits, 75 + 120 + 1800);
+    for id in ENEMIES {
+        assert_eq!(w.objectives.get(&format!("{id}:defeated")), Some(&1));
+        assert!(
+            w.mod_sounds
+                .contains(&ContentId::new(format!("{id}:death")).unwrap())
+        );
+    }
+    let previous = w.player.credits;
+    w.step(Input::default(), &a.registry, &mut a.scripts)
+        .unwrap();
+    assert_eq!(w.player.credits, previous);
+    assert!(w.mod_sounds.is_empty());
+}
+
+#[test]
+fn enemy_scripts_replay_identically_and_restore_serialized_state() {
+    let (_temp, mut first) = active(&ENEMIES);
+    let (_other, mut second) = active(&ENEMIES);
+    let mut a = world(&first);
+    for (index, id) in ENEMIES.iter().enumerate() {
+        a.spawn(
+            &ContentId::new(format!("{id}:unit")).unwrap(),
+            60 + index as i32 * 30,
+            -24,
+            &first.registry,
+        )
+        .unwrap();
+    }
+    a.player.x = 0;
+    let mut b = a.clone();
+    for _ in 0..75 {
+        a.step(Input::default(), &first.registry, &mut first.scripts)
+            .unwrap();
+        b.step(Input::default(), &second.registry, &mut second.scripts)
+            .unwrap();
+        assert_eq!(a.digest(), b.digest());
+        assert_eq!(first.scripts.checkpoints(), second.scripts.checkpoints());
+    }
+    let snapshot = serde_json::to_vec(&a).unwrap();
+    b = serde_json::from_slice(&snapshot).unwrap();
+    let checkpoint = first.scripts.checkpoints();
+    second.scripts.restore(checkpoint);
+    for _ in 0..25 {
+        a.step(Input::default(), &first.registry, &mut first.scripts)
+            .unwrap();
+        b.step(Input::default(), &second.registry, &mut second.scripts)
+            .unwrap();
+        assert_eq!(a.digest(), b.digest());
+    }
+}
+
+#[test]
+fn mission_defeat_counts_reset_while_persistent_script_statistics_continue() {
+    let (_temp, mut a) = active(&ENEMIES);
+    for id in ENEMIES {
+        let unit = ContentId::new(format!("{id}:unit")).unwrap();
+        let mut first = world(&a);
+        for _ in 0..2 {
+            let entity = first.spawn(&unit, 20, 0, &a.registry).unwrap();
+            first
+                .step(Input::default(), &a.registry, &mut a.scripts)
+                .unwrap();
+            first
+                .apply_commands(
+                    &[Command::Damage {
+                        entity,
+                        amount: 100000,
+                    }],
+                    &a.registry,
+                )
+                .unwrap();
+            first
+                .step(Input::default(), &a.registry, &mut a.scripts)
+                .unwrap();
+        }
+        assert_eq!(first.objectives.get(&format!("{id}:defeated")), Some(&2));
+        let mut next = world(&a);
+        let entity = next.spawn(&unit, 20, 0, &a.registry).unwrap();
+        next.step(Input::default(), &a.registry, &mut a.scripts)
+            .unwrap();
+        next.apply_commands(
+            &[Command::Damage {
+                entity,
+                amount: 100000,
+            }],
+            &a.registry,
+        )
+        .unwrap();
+        next.step(Input::default(), &a.registry, &mut a.scripts)
+            .unwrap();
+        assert_eq!(next.objectives.get(&format!("{id}:defeated")), Some(&1));
+        let state = a.scripts.checkpoints().0;
+        assert_eq!(state[&format!("{id}/scripts/ai.rhai")]["destroyed"], 3);
+        if id == "iron_coast_boss" {
+            assert!(
+                state[&format!("{id}/scripts/ai.rhai")]["directions"]
+                    .as_object()
+                    .unwrap()
+                    .is_empty()
+            );
+        }
+    }
+}
+
+#[test]
+fn shipped_enemy_assets_are_valid_and_aligned() {
+    let root = Path::new(env!("CARGO_MANIFEST_DIR")).join("examples/mods");
+    let selected: Vec<_> = ENEMIES.iter().map(|id| id.to_string()).collect();
+    let discovery = modding::discover(&root);
+    ActiveMods::build(&base(), &discovery, &selected, None).unwrap();
+    for id in ENEMIES {
+        let content: ContentPack =
+            serde_json::from_slice(&fs::read(root.join(id).join("content.json")).unwrap()).unwrap();
+        let art = content.enemies[0].art.as_ref().unwrap();
+        for path in [art.png.as_ref().unwrap(), art.hd_png.as_ref().unwrap()] {
+            let image = image::open(root.join(id).join(path)).unwrap().into_rgba8();
+            assert_eq!(
+                image.width() / art.frames * art.logical_height,
+                image.height() * art.logical_width
+            );
+            for frame in 0..art.frames {
+                let width = image.width() / art.frames;
+                for x in frame * width..(frame + 1) * width {
+                    assert!(image.get_pixel(x, 0)[3] < 128);
+                    assert!(image.get_pixel(x, image.height() - 1)[3] < 128);
+                }
+                for y in 0..image.height() {
+                    assert!(image.get_pixel(frame * width, y)[3] < 128);
+                    assert!(image.get_pixel((frame + 1) * width - 1, y)[3] < 128);
+                }
+            }
+        }
+    }
+}
diff --git a/tests/iron_coast.rs b/tests/iron_coast.rs
new file mode 100644
index 00000000..252d9ec2
--- /dev/null
+++ b/tests/iron_coast.rs
@@ -0,0 +1,291 @@
+//! Campaign acceptance uses synthetic PNG/WAV assets; original data is unnecessary.
+use raptor_replica::{
+    content::{ContentPack, Registry},
+    modding::{self, ActiveMods, Manifest},
+    persistence::Pilot,
+    simulation::{Input, Outcome, World},
+};
+use serde_json::{Value, json};
+use std::{
+    fs,
+    path::{Path, PathBuf},
+};
+
+const PACKAGES: [&str; 7] = [
+    "iron_coast_scout",
+    "iron_coast_turret",
+    "iron_coast_boss",
+    "pulse_cannon",
+    "seeker_swarm",
+    "ion_lance",
+    "iron_coast_mission_1",
+];
+const MISSION: &str = "iron_coast_mission_1:mission_01";
+
+fn base() -> Registry {
+    let mut registry = Registry::default();
+    let pack:ContentPack=serde_json::from_value(json!({
+        "weapons":[{"id":"base:projectile_forward_guns","name":"Forward Guns","damage":1,"speed":8,"cooldown":2,"behavior":"straight","target":"all","legacy":0,"art":{"asset":42,"logical_width":4,"logical_height":8,"frames":4}}],
+        "items":[{"id":"base:forward_guns","name":"Forward Guns","price":0,"max_count":1,"weapon":"base:projectile_forward_guns","legacy":0},{"id":"base:energy","name":"Shield","price":0,"max_count":100,"legacy":16}],
+        "missions":[{"id":"base:sector_1_wave_1","name":"Base fixture","duration":1000}]
+    })).unwrap();
+    registry.apply(pack, "base").unwrap();
+    registry.validate().unwrap();
+    registry
+}
+
+fn fixture_resources(value: &Value, root: &Path) {
+    match value {
+        Value::Object(object) => {
+            if let (Some(width), Some(height)) = (
+                object.get("logical_width").and_then(Value::as_u64),
+                object.get("logical_height").and_then(Value::as_u64),
+            ) {
+                let frames = object.get("frames").and_then(Value::as_u64).unwrap_or(1);
+                for (key, scale) in [("png", 1), ("hd_png", 4)] {
+                    if let Some(file) = object.get(key).and_then(Value::as_str) {
+                        let path = root.join(file);
+                        fs::create_dir_all(path.parent().unwrap()).unwrap();
+                        let image = image::RgbaImage::from_pixel(
+                            (width * frames * scale) as u32,
+                            (height * scale) as u32,
+                            image::Rgba([80, 96, 104, 255]),
+                        );
+                        image.save(path).unwrap();
+                    }
+                }
+            }
+            if let Some(file) = object.get("file").and_then(Value::as_str) {
+                let path = root.join(file);
+                fs::create_dir_all(path.parent().unwrap()).unwrap();
+                // Small valid mono PCM16 WAV; integration checks use the actual cues.
+                let mut wav = Vec::new();
+                wav.extend_from_slice(b"RIFF");
+                wav.extend_from_slice(&100_u32.to_le_bytes());
+                wav.extend_from_slice(b"WAVEfmt ");
+                wav.extend_from_slice(&16_u32.to_le_bytes());
+                wav.extend_from_slice(&1_u16.to_le_bytes());
+                wav.extend_from_slice(&1_u16.to_le_bytes());
+                wav.extend_from_slice(&22050_u32.to_le_bytes());
+                wav.extend_from_slice(&44100_u32.to_le_bytes());
+                wav.extend_from_slice(&2_u16.to_le_bytes());
+                wav.extend_from_slice(&16_u16.to_le_bytes());
+                wav.extend_from_slice(b"data");
+                wav.extend_from_slice(&64_u32.to_le_bytes());
+                wav.extend_from_slice(&[0; 64]);
+                fs::write(path, wav).unwrap();
+            }
+            for child in object.values() {
+                fixture_resources(child, root);
+            }
+        }
+        Value::Array(values) => {
+            for child in values {
+                fixture_resources(child, root);
+            }
+        }
+        _ => {}
+    }
+}
+
+fn active() -> (tempfile::TempDir, ActiveMods) {
+    let temporary = tempfile::tempdir().unwrap();
+    let source = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("examples/mods");
+    for id in PACKAGES {
+        let original = source.join(id);
+        let root = temporary.path().join(id);
+        fs::create_dir_all(&root).unwrap();
+        let manifest_data = fs::read(original.join("mod.toml"))
+            .expect("all seven Iron Coast packages must be installed");
+        let manifest: Manifest =
+            toml::from_str(std::str::from_utf8(&manifest_data).unwrap()).unwrap();
+        fs::write(root.join("mod.toml"), manifest_data).unwrap();
+        let content = fs::read(original.join(&manifest.content)).unwrap();
+        let value: Value = serde_json::from_slice(&content).unwrap();
+        fs::write(root.join(&manifest.content), content).unwrap();
+        for script in &manifest.scripts {
+            let path = root.join(script);
+            fs::create_dir_all(path.parent().unwrap()).unwrap();
+            fs::copy(original.join(script), path).unwrap();
+        }
+        fixture_resources(&value, &root);
+    }
+    let discovery = modding::discover(temporary.path());
+    assert!(discovery.errors.is_empty(), "{:?}", discovery.errors);
+    let enabled = PACKAGES.iter().map(|s| s.to_string()).collect::<Vec<_>>();
+    let active = ActiveMods::build(&base(), &discovery, &enabled, None).unwrap();
+    (temporary, active)
+}
+
+#[test]
+fn campaign_dependencies_and_generated_footprints_validate_together() {
+    let (_temporary, active) = active();
+    assert_eq!(active.pins.len(), 7);
+    let mission = &active.registry.missions[&MISSION.into()];
+    assert!(!mission.auto_complete);
+    assert_eq!(mission.columns, 9);
+    assert_eq!(mission.layout.len(), 72 * 9);
+    assert!(
+        mission
+            .spawns
+            .iter()
+            .any(|s| s.enemy.0 == "iron_coast_boss:unit" && s.tick == 720)
+    );
+    assert_eq!(mission.art.as_ref().unwrap().logical_width, 320);
+    assert!(
+        active.registry.campaigns[&"iron_coast_mission_1:campaign".into()]
+            .missions
+            .contains(&MISSION.into())
+    );
+}
+
+#[test]
+fn boss_alone_cannot_complete_and_reward_is_paid_once() {
+    let (_temporary, mut active) = active();
+    let mut world = World::new(&MISSION.into(), &Pilot::default(), &active.registry).unwrap();
+    world
+        .step(Input::default(), &active.registry, &mut active.scripts)
+        .unwrap();
+    world
+        .objectives
+        .insert("iron_coast_boss:defeated".into(), 1);
+    world
+        .objectives
+        .insert("iron_coast_turret:defeated".into(), 1);
+    world
+        .step(Input::default(), &active.registry, &mut active.scripts)
+        .unwrap();
+    assert_eq!(world.outcome, Outcome::Playing);
+    world
+        .objectives
+        .insert("iron_coast_turret:defeated".into(), 2);
+    world
+        .step(Input::default(), &active.registry, &mut active.scripts)
+        .unwrap();
+    assert_eq!(world.outcome, Outcome::Complete);
+    assert_eq!(world.objectives["iron_coast_mission_1:complete"], 1);
+    assert_eq!(world.player.credits, 5000);
+    assert_eq!(world.objectives["iron_coast_mission_1:debrief"], 1);
+    world
+        .step(Input::default(), &active.registry, &mut active.scripts)
+        .unwrap();
+    assert_eq!(world.player.credits, 5000);
+}
+
+fn play(use_trial: bool) -> (World, Vec<(u64, String)>) {
+    let (_temporary, mut active) = active();
+    let mut world = World::new(&MISSION.into(), &Pilot::default(), &active.registry).unwrap();
+    let mut seen = Vec::new();
+    for tick in 0..2000 {
+        let input = Input {
+            fire: true,
+            special: tick % 90 == 60,
+            cycle: tick == 1,
+            absolute: Some([144, 160]),
+            ..Input::default()
+        };
+        world
+            .step(input, &active.registry, &mut active.scripts)
+            .unwrap();
+        if tick == 0 && !use_trial {
+            world
+                .player
+                .inventory
+                .remove(&"pulse_cannon:equipment".into());
+        }
+        for enemy in &world.enemies {
+            if !seen.iter().any(|(_, id)| id == &enemy.definition.0) {
+                seen.push((world.tick, enemy.definition.0.clone()));
+            }
+        }
+        if world.outcome != Outcome::Playing {
+            break;
+        }
+    }
+    if use_trial {
+        let weapon_state = &active.scripts.states["pulse_cannon/scripts/weapon.rhai"];
+        assert!(weapon_state["bursts"].as_i64().unwrap() > 0);
+        assert!(weapon_state["hits"].as_i64().unwrap() > 0);
+        let serialized = serde_json::to_string(&active.scripts.states).unwrap();
+        let recovered: serde_json::Value = serde_json::from_str(&serialized).unwrap();
+        assert_eq!(recovered["pulse_cannon/scripts/weapon.rhai"], *weapon_state);
+    }
+    (world, seen)
+}
+
+#[test]
+fn restarted_mission_counts_new_turret_kills_independently_of_saved_statistics() {
+    let (_temporary, mut active) = active();
+    for _ in 0..2 {
+        let mut world = World::new(&MISSION.into(), &Pilot::default(), &active.registry).unwrap();
+        world
+            .step(Input::default(), &active.registry, &mut active.scripts)
+            .unwrap();
+        let entity = world
+            .spawn(&"iron_coast_turret:unit".into(), 144, 0, &active.registry)
+            .unwrap();
+        world
+            .step(Input::default(), &active.registry, &mut active.scripts)
+            .unwrap();
+        world
+            .apply_commands(
+                &[modding::Command::Damage {
+                    entity,
+                    amount: 1000,
+                }],
+                &active.registry,
+            )
+            .unwrap();
+        world
+            .step(Input::default(), &active.registry, &mut active.scripts)
+            .unwrap();
+        assert_eq!(world.objectives["iron_coast_turret:defeated"], 1);
+        assert_eq!(world.outcome, Outcome::Playing);
+    }
+    assert_eq!(
+        active.scripts.states["iron_coast_turret/scripts/ai.rhai"]["destroyed"],
+        2
+    );
+}
+
+#[test]
+fn starter_guns_can_complete_real_waves_and_boss() {
+    let (world, seen) = play(false);
+    assert_eq!(
+        world.outcome,
+        Outcome::Complete,
+        "tick={} shield={} objectives={:?}",
+        world.tick,
+        world.player.shield,
+        world.objectives
+    );
+    assert!(
+        seen.iter()
+            .any(|(tick, id)| *tick >= 720 && id == "iron_coast_boss:unit")
+    );
+    assert!(world.objectives["iron_coast_turret:defeated"] >= 2);
+    assert!(world.objectives["iron_coast_boss:defeated"] >= 1);
+    assert_eq!(world.objectives["iron_coast_mission_1:phase"], 4);
+    assert!(world.player.shield > 0);
+    assert!(world.tick > 720 && world.tick < 2000);
+}
+
+#[test]
+fn trial_pulse_cannon_completes_and_preserves_scripted_weapon_state() {
+    let (world, _seen) = play(true);
+    assert_eq!(
+        world.outcome,
+        Outcome::Complete,
+        "tick={} shield={} objectives={:?}",
+        world.tick,
+        world.player.shield,
+        world.objectives
+    );
+    assert!(
+        world
+            .player
+            .inventory
+            .contains_key(&"pulse_cannon:equipment".into())
+    );
+    assert!(world.player.credits >= 5000);
+}
diff --git a/tests/weapons_mods.rs b/tests/weapons_mods.rs
new file mode 100644
index 00000000..8b5599cf
--- /dev/null
+++ b/tests/weapons_mods.rs
@@ -0,0 +1,373 @@
+//! Validate the shipped weapon definitions/scripts using synthetic PNG and WAV inputs.
+//! No original or locally generated game artwork is needed in CI.
+use raptor_replica::{
+    content::{ContentId, ContentPack, Registry},
+    modding::{self, ActiveMods},
+    persistence::Pilot,
+    simulation::{Input, World},
+};
+use serde_json::{Value, json};
+use std::{fs, path::Path};
+
+const PACKAGES: [&str; 3] = ["pulse_cannon", "seeker_swarm", "ion_lance"];
+fn content(value: Value) -> ContentPack {
+    serde_json::from_value(value).unwrap()
+}
+fn base() -> Registry {
+    let mut registry = Registry::default();
+    registry.apply(content(json!({
+        "items": [{"id":"base:energy","name":"Shield","price":100,"max_count":100}],
+        "missions": [{"id":"base:practice","name":"Practice","duration":2000}],
+        "enemies": [
+            {"id":"base:target","name":"Stationary target","health":100,"speed":0},
+            {"id":"base:ground_target","name":"Ground target","health":100,"speed":0,"ground":true}
+        ]
+    })), "base").unwrap();
+    registry
+}
+fn wav() -> Vec<u8> {
+    let mut bytes = b"RIFF".to_vec();
+    bytes.extend(164u32.to_le_bytes());
+    bytes.extend(b"WAVEfmt ");
+    bytes.extend(16u32.to_le_bytes());
+    bytes.extend(1u16.to_le_bytes());
+    bytes.extend(1u16.to_le_bytes());
+    bytes.extend(11025u32.to_le_bytes());
+    bytes.extend(22050u32.to_le_bytes());
+    bytes.extend(2u16.to_le_bytes());
+    bytes.extend(16u16.to_le_bytes());
+    bytes.extend(b"data");
+    bytes.extend(128u32.to_le_bytes());
+    bytes.extend([0; 128]);
+    bytes
+}
+fn install_synthetic(root: &Path, id: &str) {
+    let source = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .join("examples/mods")
+        .join(id);
+    let target = root.join(id);
+    fs::create_dir_all(target.join("scripts")).unwrap();
+    fs::create_dir_all(target.join("art")).unwrap();
+    fs::create_dir_all(target.join("audio")).unwrap();
+    for file in [
+        "mod.toml",
+        "content.json",
+        "scripts/weapon.rhai",
+        "scripts/equipment.rhai",
+    ] {
+        fs::copy(source.join(file), target.join(file)).unwrap();
+    }
+    let definitions: Value =
+        serde_json::from_slice(&fs::read(target.join("content.json")).unwrap()).unwrap();
+    for entry in definitions["weapons"]
+        .as_array()
+        .unwrap()
+        .iter()
+        .chain(definitions["items"].as_array().unwrap())
+    {
+        let art = &entry["art"];
+        for (property, scale) in [("png", 1), ("hd_png", 4)] {
+            let image = image::RgbaImage::from_pixel(
+                art["logical_width"].as_u64().unwrap() as u32 * scale,
+                art["logical_height"].as_u64().unwrap() as u32 * scale,
+                image::Rgba([60, 90, 120, 255]),
+            );
+            image
+                .save(target.join(art[property].as_str().unwrap()))
+                .unwrap();
+        }
+    }
+    for sound in definitions["sounds"].as_array().unwrap() {
+        fs::write(target.join(sound["file"].as_str().unwrap()), wav()).unwrap();
+    }
+}
+fn activate(ids: &[&str]) -> (tempfile::TempDir, ActiveMods) {
+    let root = tempfile::tempdir().unwrap();
+    for id in ids {
+        install_synthetic(root.path(), id);
+    }
+    let discovery = modding::discover(root.path());
+    assert!(discovery.errors.is_empty(), "{:?}", discovery.errors);
+    let active = ActiveMods::build(
+        &base(),
+        &discovery,
+        &ids.iter().map(|id| id.to_string()).collect::<Vec<_>>(),
+        None,
+    )
+    .unwrap();
+    (root, active)
+}
+fn pilot(id: &str, registry: &Registry) -> Pilot {
+    let equipment = ContentId::new(format!("{id}:equipment")).unwrap();
+    Pilot {
+        inventory: [(equipment.clone(), 1), ("base:energy".into(), 100)]
+            .into_iter()
+            .collect(),
+        selected: registry.items[&equipment].special.then_some(equipment),
+        mission: "base:practice".into(),
+        ..Pilot::default()
+    }
+}
+fn world(id: &str, registry: &Registry) -> World {
+    World::new(&"base:practice".into(), &pilot(id, registry), registry).unwrap()
+}
+fn state<'a>(active: &'a ActiveMods, id: &str) -> &'a Value {
+    &active.scripts.states[&format!("{id}/scripts/weapon.rhai")]
+}
+
+#[test]
+fn each_weapon_package_is_independent_and_the_three_can_coexist() {
+    for id in PACKAGES {
+        let (_root, active) = activate(&[id]);
+        assert_eq!(active.pins.len(), 1);
+        assert_eq!(active.pins[0].version, "1.0.0");
+        assert_eq!(active.registry.weapons.len(), 1);
+        assert_eq!(active.registry.sounds.len(), 2);
+        assert!(
+            active
+                .registry
+                .items
+                .contains_key(&format!("{id}:equipment").as_str().into())
+        );
+        assert!(
+            active
+                .registry
+                .weapons
+                .contains_key(&format!("{id}:projectile").as_str().into())
+        );
+    }
+    let (_root, all) = activate(&PACKAGES);
+    assert_eq!(all.pins.len(), 3);
+    assert_eq!(all.registry.weapons.len(), 3);
+    assert_eq!(all.registry.sounds.len(), 6);
+    assert!(all.registry.overrides.is_empty());
+}
+
+#[test]
+fn shop_charges_each_price_and_rejects_duplicate_equipment() {
+    let (_root, active) = activate(&PACKAGES);
+    for id in PACKAGES {
+        let item: ContentId = format!("{id}:equipment").as_str().into();
+        let price = active.registry.items[&item].price;
+        let mut pilot = Pilot {
+            credits: price,
+            inventory: Default::default(),
+            ..Pilot::default()
+        };
+        pilot.buy(&item, &active.registry).unwrap();
+        assert_eq!(pilot.credits, 0);
+        assert_eq!(pilot.inventory[&item], 1);
+        assert!(pilot.buy(&item, &active.registry).is_err());
+        pilot.sell(&item, &active.registry).unwrap();
+        assert!(pilot.credits > 0);
+        assert_eq!(pilot.inventory.get(&item).copied().unwrap_or(0), 0);
+    }
+}
+
+#[test]
+fn pulse_cannon_emits_paired_rounds_and_every_third_burst_is_scripted() {
+    let (_root, mut active) = activate(&["pulse_cannon"]);
+    let mut world = world("pulse_cannon", &active.registry);
+    for _ in 0..19 {
+        world
+            .step(
+                Input {
+                    fire: true,
+                    ..Input::default()
+                },
+                &active.registry,
+                &mut active.scripts,
+            )
+            .unwrap();
+    }
+    assert_eq!(state(&active, "pulse_cannon")["bursts"], 3);
+    assert_eq!(world.projectiles.len(), 8);
+    assert_eq!(world.projectiles.iter().filter(|p| p.vx != 0).count(), 2);
+    assert_eq!(world.mod_sounds, vec![ContentId::from("pulse_cannon:fire")]);
+    assert!(!world.effects.is_empty());
+}
+
+#[test]
+fn pulse_hits_deal_damage_and_run_effect_audio_and_hit_state_callbacks() {
+    let (_root, mut active) = activate(&["pulse_cannon"]);
+    let mut world = world("pulse_cannon", &active.registry);
+    world
+        .spawn(&"base:target".into(), 140, 100, &active.registry)
+        .unwrap();
+    world
+        .step(
+            Input {
+                fire: true,
+                ..Input::default()
+            },
+            &active.registry,
+            &mut active.scripts,
+        )
+        .unwrap();
+    let mut hit_sound = false;
+    for _ in 0..8 {
+        world
+            .step(Input::default(), &active.registry, &mut active.scripts)
+            .unwrap();
+        hit_sound |= world.mod_sounds.contains(&"pulse_cannon:impact".into());
+    }
+    assert_eq!(world.enemies[0].health, 92);
+    assert_eq!(state(&active, "pulse_cannon")["hits"], 2);
+    assert!(hit_sound);
+    assert!(!world.effects.is_empty());
+}
+
+#[test]
+fn seeker_swarm_homes_and_fragmentation_damages_nearby_enemies() {
+    let (_root, mut active) = activate(&["seeker_swarm"]);
+    let mut world = world("seeker_swarm", &active.registry);
+    let primary = world
+        .spawn(&"base:target".into(), 180, 110, &active.registry)
+        .unwrap();
+    let neighbor = world
+        .spawn(&"base:ground_target".into(), 180, 110, &active.registry)
+        .unwrap();
+    world
+        .step(
+            Input {
+                fire: true,
+                ..Input::default()
+            },
+            &active.registry,
+            &mut active.scripts,
+        )
+        .unwrap();
+    assert_eq!(world.projectiles.len(), 3);
+    assert!(world.projectiles.iter().all(|p| p.vx > 0));
+    for _ in 0..12 {
+        world
+            .step(Input::default(), &active.registry, &mut active.scripts)
+            .unwrap();
+    }
+    let target = world.enemies.iter().find(|e| e.entity == primary).unwrap();
+    let nearby = world.enemies.iter().find(|e| e.entity == neighbor).unwrap();
+    assert_eq!(target.health, 82);
+    assert_eq!(nearby.health, 94);
+    assert_eq!(state(&active, "seeker_swarm")["hits"], 3);
+}
+
+#[test]
+fn ion_lance_pierces_air_and_ground_targets_in_its_column_only() {
+    let (_root, mut active) = activate(&["ion_lance"]);
+    let mut world = world("ion_lance", &active.registry);
+    world
+        .spawn(&"base:target".into(), 144, 100, &active.registry)
+        .unwrap();
+    world
+        .spawn(&"base:ground_target".into(), 144, 60, &active.registry)
+        .unwrap();
+    world
+        .spawn(&"base:target".into(), 220, 60, &active.registry)
+        .unwrap();
+    world
+        .step(
+            Input {
+                fire: true,
+                ..Input::default()
+            },
+            &active.registry,
+            &mut active.scripts,
+        )
+        .unwrap();
+    world
+        .step(Input::default(), &active.registry, &mut active.scripts)
+        .unwrap();
+    assert_eq!(
+        world.enemies.iter().map(|e| e.health).collect::<Vec<_>>(),
+        [84, 84, 100]
+    );
+    assert_eq!(state(&active, "ion_lance")["hits"], 4);
+    assert!(world.mod_sounds.contains(&"ion_lance:impact".into()));
+    assert!(!world.effects.is_empty());
+}
+
+#[test]
+fn equipped_specials_and_primary_upgrade_fire_without_consuming_equipment() {
+    let (_root, mut active) = activate(&PACKAGES);
+    let mut pilot = pilot("pulse_cannon", &active.registry);
+    pilot.inventory.insert("seeker_swarm:equipment".into(), 1);
+    pilot.inventory.insert("ion_lance:equipment".into(), 1);
+    pilot.selected = Some("ion_lance:equipment".into());
+    let mut world = World::new(&pilot.mission, &pilot, &active.registry).unwrap();
+    world
+        .step(
+            Input {
+                fire: true,
+                ..Input::default()
+            },
+            &active.registry,
+            &mut active.scripts,
+        )
+        .unwrap();
+    assert_eq!(state(&active, "pulse_cannon")["bursts"], 1);
+    assert_eq!(state(&active, "ion_lance")["bursts"], 1);
+    assert!(
+        !active
+            .scripts
+            .states
+            .contains_key("seeker_swarm/scripts/weapon.rhai")
+    );
+    for id in PACKAGES {
+        assert_eq!(
+            world.player.inventory[&format!("{id}:equipment").as_str().into()],
+            1
+        );
+    }
+    world.player.selected = Some("seeker_swarm:equipment".into());
+    world
+        .step(
+            Input {
+                special: true,
+                ..Input::default()
+            },
+            &active.registry,
+            &mut active.scripts,
+        )
+        .unwrap();
+    assert_eq!(state(&active, "seeker_swarm")["bursts"], 1);
+}
+
+#[test]
+fn scripted_bursts_and_state_resume_deterministically() {
+    let (_root, mut active) = activate(&["pulse_cannon"]);
+    let mut world = world("pulse_cannon", &active.registry);
+    for _ in 0..10 {
+        world
+            .step(
+                Input {
+                    fire: true,
+                    ..Input::default()
+                },
+                &active.registry,
+                &mut active.scripts,
+            )
+            .unwrap();
+    }
+    let mut resumed = world.clone();
+    let (_other_root, mut other) = activate(&["pulse_cannon"]);
+    other.scripts.states = active.scripts.states.clone();
+    other.scripts.rng = active.scripts.rng.clone();
+    for _ in 0..20 {
+        let input = Input {
+            fire: true,
+            ..Input::default()
+        };
+        world
+            .step(input, &active.registry, &mut active.scripts)
+            .unwrap();
+        resumed
+            .step(input, &other.registry, &mut other.scripts)
+            .unwrap();
+    }
+    assert_eq!(world.digest(), resumed.digest());
+    assert_eq!(active.scripts.states, other.scripts.states);
+    assert_eq!(
+        serde_json::to_value(&active.scripts.rng).unwrap(),
+        serde_json::to_value(&other.scripts.rng).unwrap()
+    );
+}