fx-bundle

# FX Bundle Use this skill for a projectile, impact, explosion, pickup, muzzle flash, slash arc, aura loop, dust, or another detached foreground effect. A request produces either one static `Texture2D` effect or one independently animated `SpriteFrames` effect. Read `../_shared/asset-skill-contract.md` before accepting a request. First validate the shared request/result shape with `tools/asset_skill_contract_check.py`, then validate this family contract with `tools/asset_animated_bundle_contract_check.py --kind request`. For final runtime handoff, call the same checker with `--request <request.json> --result <result.json>`; this is required to bind `spec.mode` to the output type and source layout. Final handoff accepts only `validation.passed: true` with explicit passing `L0` through `L4` evidence. The family checker is the callable enforcement for the `spec` rules below; the shared checker alone intentionally validates only cross-family shape. ## Standalone boundary Accept only an asset request. Do not read or require `/gm-asset`, tags, stage state, `ASSETS.md`, generated manifests, stable entries, worker dispatch, or any other registration state. Return the shared asset result directly; a caller may register it separately. ## Request contract The request has `asset_type: "fx-bundle"` and `spec.mode` equal to either `static` or `animated`. - `static` has one transparent foreground image and no animation contract. It returns a `Texture2D` at the image path. - `animat...