suaveplan/openspec/changes/enterprise-gaming-leaderboard/tasks.md

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