# Tasks: enterprise-gaming-character-physics

## 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

- [ ] Create `gaming/rigs/character-physics/` (`@suaveplan/character-physics`, `0.1.0`, `sideEffects: false`)
- [ ] `tsconfig.json`, `vitest.config.ts`

## Phase 2 — Error codes & constants

- [ ] `src/error-codes.ts` + `src/constants/index.ts`

## Phase 3 — Types

- [ ] `src/types/common.ts` + `common.md` — `Vec3`, `CharacterControllerOptions`, `PhysicsBackend`, `RaycastHit`, `SweepHit`

## Phase 4 — Spring & slope utils

- [ ] `src/utils/spring.ts` — PD spring force + damping, convergence test
- [ ] `src/utils/slope.ts` — project velocity onto normal, slope angle check
- [ ] Tests + docs

## Phase 5 — Null backend

- [ ] `src/backends/null-backend/null-backend.ts` — always returns no hit; for unit testing controller math
- [ ] Tests + docs

## Phase 6 — Character controller

- [ ] `src/core/character-controller/character-controller.ts` — spring levitation, slope/step logic, jump impulse, OTel
- [ ] Events: ground contact, jump, land
- [ ] Tests + docs

## Phase 7 — Property tests

- [ ] `tests/property.test.ts` — spring converges to float distance within N frames for any initial position

## Phase 8 — Pre-publish gate

- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/character-physics` green
- [ ] 100% coverage
- [ ] Publish: `bun scripts/publish.ts --package @suaveplan/character-physics`