Add scripted lightning weapon mods with interpolated anchored effects

mods/AGENTS.md

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+# Instructions for AI agents authoring mods
+
+Read [the mod authoring checklist](../docs/mod-authoring-checklist.md) and
+[the version 1 API](../docs/modding-api.md) before creating or changing a mod.
+Follow the user's requested behavior and controls, and preserve other agents'
+work in the shared checkout.
+
+- Implement gameplay through content definitions, Rhai callbacks and documented
+  commands. Keep a standalone mod independent unless its content needs a real
+  dependency. Do not select legacy engine behavior for new content.
+- If the API lacks a required capability, define the smallest general addition
+  and coordinate engine work with the responsible agent when authorized. Keep
+  content-specific targeting, damage and tuning in the mod.
+- Ship actual SD and HD PNG assets for every artwork reference, plus required
+  sounds/music. Keep dimensions, frame alignment and transparency consistent.
+  Store generation prompts, provenance and reproduction recipes with the mod.
+- Price equipment against original and shipped equipment, using controlled
+  simulation observations as well as targeting, range, cooldown and loadout
+  utility. Do not copy cheap placeholder prices from an example.
+- Finish independent activation, gameplay and coexistence tests, real package
+  validation where the original catalog is available, and a visual check of
+  both SD and HD. Document any checks that cannot run.
+- Document enabling, controls, prices and behavior limits. Deliver complete
+  local packages without changing the user's pilot, selected mods or unrelated
+  content unless requested.