Add separate Iron Coast mission, weapon and enemy mods with SD HD artwork and audio

examples/mods/iron_coast_mission_1/README.md

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+# 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.