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

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