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

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+# OpenSpec Change: enterprise-gaming-r3f-physics-core
+
+- **Change ID**: enterprise-gaming-r3f-physics-core
+- **Package**: `@suaveplan/r3f-physics-core`
+- **Category**: gaming/physics
+- **Target path**: `gaming/physics/r3f-physics-core`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-physics-core` on the genesis branch from scratch at enterprise quality. The package provides a physics engine abstraction layer for React Three Fiber: a `PhysicsProvider` React context wraps any physics backend (Rapier, Cannon, custom); `useRigidBody()`, `useCollider()`, and `usePhysicsWorld()` hooks provide access to physics primitives in a backend-agnostic way. The `PhysicsBackend` interface matches `@suaveplan/character-physics`'s `PhysicsBackend` + `@suaveplan/vehicle-physics`'s `VehiclePhysicsBackend`. Genesis adds structured errors, OTel step-time histogram, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`, react, `@react-three/fiber`, three.
+
+---
+
+## Public API surface
+
+```ts
+function PhysicsProvider(props: PhysicsProviderProps): JSX.Element
+// backend, gravity, fixedStep, debug
+
+function usePhysicsWorld(): PhysicsWorld
+function useRigidBody(options: RigidBodyOptions): RigidBodyHandle
+function useCollider(body: RigidBodyHandle, desc: ColliderDesc): ColliderHandle
+
+interface PhysicsWorld {
+  step(dt: number): void
+  raycast(origin: Vec3, dir: Vec3, maxDist: number): RaycastHit | null
+  readonly bodies: ReadonlyMap<string, RigidBodyHandle>
+}
+```
+
+---
+
+## File layout
+
+```text
+gaming/physics/r3f-physics-core/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts
+    types/common.ts + md
+    context/physics-provider.tsx + md + test
+    hooks/
+      use-physics-world.ts + md + test
+      use-rigid-body.ts + md + test
+      use-collider.ts + md + test
+  tests/integration.test.ts
+```

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

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+# Tasks: enterprise-gaming-r3f-physics-core
+
+## 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 + interfaces
+
+## Phase 2 — PhysicsProvider context
+
+- [ ] Backend injection, fixed-step accumulator, debug toggle
+
+## Phase 3 — Hooks: usePhysicsWorld / useRigidBody / useCollider
+
+- [ ] Tests + docs for each
+
+## Phase 4 — Pre-publish gate
+
+- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/r3f-physics-core` green
+- [ ] 100% coverage
+- [ ] Publish: `bun scripts/publish.ts --package @suaveplan/r3f-physics-core`