# Tasks: enterprise-gaming-leaderboard

## 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/multiplayer/leaderboard/` (`@suaveplan/leaderboard`, `0.1.0`, `sideEffects: false`)
- [ ] `tsconfig.json`, `vitest.config.ts`

## Phase 2 — Error codes & constants

- [ ] `src/error-codes.ts` + `src/constants/index.ts` — `DEFAULT_PAGE_SIZE`, `DEFAULT_AROUND_RADIUS`

## Phase 3 — Types

- [ ] `src/types/common.ts` + `common.md`

## Phase 4 — Leaderboard

- [ ] `src/core/leaderboard/leaderboard.ts` — sorted array (binary search insert), submit/getEntry/getRank/getPage/aroundPlayer/reset, OTel
- [ ] Tests (rank monotonicity, maxEntries eviction, asc/desc ordering)
- [ ] Docs

## Phase 5 — Season manager

- [ ] `src/core/season-manager/season-manager.ts` — season lifecycle, archiveCurrent, tick expiry, events
- [ ] Tests + docs

## Phase 6 — Property tests

- [ ] `tests/property.test.ts` — rank = position in sorted order for any input sequence; aroundPlayer always includes player

## Phase 7 — Integration tests

- [ ] `tests/integration.test.ts` — submit → rank → season reset → archive

## Phase 8 — Pre-publish gate

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