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openspec/changes/enterprise-gaming-day-night/tasks.md

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+# Tasks: enterprise-gaming-day-night
+
+## 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/world/day-night/` (`@suaveplan/day-night`, `0.1.0`, `sideEffects: false`)
+- [ ] `tsconfig.json`, `vitest.config.ts`
+
+## Phase 2 — Error codes & constants
+
+- [ ] `src/error-codes.ts` + `src/constants/index.ts` — `DEFAULT_TIME_SCALE`, `HOURS_IN_DAY`
+
+## Phase 3 — Types
+
+- [ ] `src/types/common.ts` + `common.md`
+
+## Phase 4 — Sky position utils
+
+- [ ] `src/utils/sky-position.ts` — simplified celestial math: sun elevation peaks at noon, moon at midnight
+- [ ] Tests + docs
+
+## Phase 5 — Day/night clock
+
+- [ ] `src/core/day-night-clock/day-night-clock.ts` — time scale, tick/pause/resume, dawn/dusk events, OTel gauge
+- [ ] Tests (time scale, day boundary wrap, events)
+- [ ] Docs
+
+## Phase 6 — Light schedule
+
+- [ ] `src/core/light-schedule/light-schedule.ts` — keyframe interpolation (lerp color/intensity between keyframes)
+- [ ] Tests + docs
+
+## Phase 7 — Gameplay modifiers
+
+- [ ] `src/core/gameplay-modifiers/gameplay-modifiers.ts` — time-segment lookup + merge defaults
+- [ ] Tests + docs
+
+## Phase 8 — Integration tests
+
+- [ ] `tests/integration.test.ts` — advance clock through full day, verify light + modifier evaluations
+
+## Phase 9 — Pre-publish gate
+
+- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/day-night` green
+- [ ] 100% coverage
+- [ ] Publish: `bun scripts/publish.ts --package @suaveplan/day-night`