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openspec/changes/enterprise-gaming-r3f-animation/proposal.md

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+# OpenSpec Change: enterprise-gaming-r3f-animation
+
+- **Change ID**: enterprise-gaming-r3f-animation
+- **Package**: `@suaveplan/r3f-animation`
+- **Category**: gaming/character
+- **Target path**: `gaming/character/r3f-animation`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/r3f-animation.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-animation` on the genesis branch from scratch at enterprise quality. The package provides animation state machine, blend trees, and layers for React Three Fiber. An `AnimationStateMachine` manages named states with blend tree leaves and transition conditions; `AnimationLayer` enables masked additive/override layers (e.g. upper-body aim overlay); `AnimationBlendTree` interpolates between clips by blend parameters (speed, direction). `@suaveplan/mixamo` normalisation and `@suaveplan/animation-events` dispatch are integrated. Genesis adds structured errors, OTel blend-duration histogram, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/types`, `@suaveplan/mixamo`, `@suaveplan/animation-events`, `@suaveplan/ik-solver`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface
+
+```ts
+function AnimationController(props: AnimationControllerProps): JSX.Element
+// stateMachine, blendParameters, layers, eventDispatcher
+
+function useAnimation(): AnimationContext
+// currentState, setParameter(), playAction(), crossFadeTo()
+```
+
+---
+
+## File layout
+
+```text
+gaming/character/r3f-animation/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts
+    types/common.ts + md
+    core/
+      state-machine/ (ts + md + types + test + index)
+      blend-tree/ (ts + md + types + test + index)
+      animation-layer/ (ts + md + types + test + index)
+    context/animation-provider.tsx + md + test
+    hooks/use-animation.ts + md + test
+    components/
+      AnimationController/ (tsx + md + test + stories + index)
+  tests/integration.test.ts
+```

openspec/changes/enterprise-gaming-r3f-animation/tasks.md

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+# Tasks: enterprise-gaming-r3f-animation
+
+## 0. Pre-flight (non-negotiable)
+
+- [ ] 0.1 Confirm clean working tree (`git status` reports nothing) and no in-flight worktrees with uncommitted work (`git worktree list` then `git status` in each)
+- [ ] 0.2 If any worktrees exist under `.claude/worktrees/`, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (`git worktree remove`) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
+- [ ] 0.3 Confirm the package set in `MANIFEST.md` matches `find packages -maxdepth 3 -name package.json` count. Drift here means a prior change archived without regenerating the manifest.
+
+## Phase 1 — Scaffold + types
+
+## Phase 2 — Blend tree
+
+- [ ] 1D/2D interpolation of clip weights by blend parameters
+- [ ] Tests + docs
+
+## Phase 3 — Animation state machine
+
+- [ ] States with blend-tree clips, transition conditions, entry/exit callbacks
+- [ ] Tests + docs
+
+## Phase 4 — Animation layer
+
+- [ ] Bone mask, additive/override mode, weight blend
+- [ ] Tests + docs
+
+## Phase 5 — Provider + `useAnimation` hook
+
+## Phase 6 — `AnimationController` component + story
+
+## Phase 7 — Pre-publish gate
+
+- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/r3f-animation` green
+- [ ] 100% coverage
+- [ ] Publish: `bun scripts/publish.ts --package @suaveplan/r3f-animation`