suaveplan/openspec/changes/enterprise-gaming-character-physics/tasks.md

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