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openspec/changes/enterprise-gaming-r3f-physics-rapier/proposal.md

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+# OpenSpec Change: enterprise-gaming-r3f-physics-rapier
+
+- **Change ID**: enterprise-gaming-r3f-physics-rapier
+- **Package**: `@suaveplan/r3f-physics-rapier`
+- **Category**: gaming/physics
+- **Target path**: `gaming/physics/r3f-physics-rapier`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-physics-rapier` on the genesis branch from scratch at enterprise quality. The package provides a Rapier physics engine integration for React Three Fiber, implementing the `PhysicsBackend` interface from `@suaveplan/r3f-physics-core`. It wraps `@dimforge/rapier3d-compat` (WASM); a `RapierPhysicsProvider` initialises the WASM module asynchronously and provides a `RAPIER.World`; `RigidBody`, `Collider`, and `Joint` components wrap the corresponding Rapier APIs; `useRapierContext()` exposes the raw `RAPIER.World` for advanced usage. Genesis adds structured errors, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/r3f-physics-core`, react, `@react-three/fiber`, `@dimforge/rapier3d-compat`, three.
+
+---
+
+## Public API surface
+
+```ts
+function RapierPhysicsProvider(props: RapierProviderProps): JSX.Element
+function RigidBody(props: RigidBodyProps): JSX.Element
+function Collider(props: ColliderProps): JSX.Element
+function useRapierContext(): RapierCon```text
+
+---
+
+## File layout
+
+```text
+gaming/physics/r3f-physics-rapier/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts
+    types/common.ts + md
+    context/rapier-provider.tsx + md + test
+    hooks/use-rapier-context.ts + md + test
+    components/
+      RigidBody/ (tsx + md + test + stories + index)
+      Collider/ (tsx + md + test + stories + index)
+  tests/integration.test.ts
+```

openspec/changes/enterprise-gaming-r3f-physics-rapier/tasks.md

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+# Tasks: enterprise-gaming-r3f-physics-rapier
+
+## 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 — RapierPhysicsProvider
+
+- [ ] Async WASM init, World creation, step on R3F frame loop
+- [ ] Tests + docs
+
+## Phase 3 — `useRapierContext` hook
+
+## Phase 4 — `RigidBody` + `Collider` components + stories
+
+## Phase 5 — Pre-publish gate
+
+- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/r3f-physics-rapier` green
+- [ ] 100% coverage
+- [ ] Publish: `bun scripts/publish.ts --package @suaveplan/r3f-physics-rapier`