# Tasks — game-server-engine-sessions (Wave B-2, re-dispatch)

## 0. Pre-flight (non-negotiable)

- [x] 0.1 `git status` clean in worktree, `git worktree list` accounted for.
- [x] 0.2 Worktree at `.claude/worktrees/agent-ae5779d2ba388beff` — isolated branch built on current genesis HEAD (`71a33ed`).
- [x] 0.3 Manifest count unchanged — no new packages added, only modules inside `@suaveplan/game-server`.

## 1. Spec authoring

- [x] 1.1 Read upstream `SessionNode.ts`, `SessionTree.ts`, `SessionStore.ts`, `PlayerManager.ts`, `SessionLifecycle.ts`.
- [x] 1.2 Read existing Wave A `core/interfaces/i-session-manager` and `i-player-manager`.
- [x] 1.3 Read existing `openspec/changes/game-server-engine-core` proposal as template.
- [x] 1.4 Drafted `proposal.md`.
- [x] 1.5 Filled `## Source mapping` table; FSM-shape requirement listed in the "no source line" table with justification.
- [x] 1.6 Drafted `specs/game-server/spec.md`.
- [x] 1.7 Every requirement carries `**Verified by:**` line.

## 2. Implementation

- [x] 2.1 Extend `GAME_SERVER_CODES` with session + player codes (11 new).
- [x] 2.2 Extend `observability/otel.ts` with `sessionLifecycleCounter`, `sessionDwellHistogram`, `playerLifecycleCounter`.
- [x] 2.3 Implement `src/engine/session-node/session-node.ts` — internal mutable graph node.
- [x] 2.4 Implement `src/engine/session-tree/session-tree.ts` — graph manager with Zod boundary.
- [x] 2.5 Implement `src/engine/session-store/session-store.ts` — `ISessionManager` impl with pluggable persistence.
- [x] 2.6 Implement `src/engine/session-lifecycle/session-lifecycle.ts` — per-session FSM.
- [x] 2.7 Implement `src/engine/player-manager/player-manager.ts` — `IPlayerManager` impl.
- [x] 2.8 Add subpath exports to `package.json` for all five new feature dirs.

## 3. Tests

- [x] 3.1 `session-node.test.ts` — 15 scenarios covering tree walks + persistence round-trip.
- [x] 3.2 `session-tree.test.ts` — 25 scenarios covering CRUD, integrity audit, restore seam.
- [x] 3.3 `session-store.test.ts` — `ISessionManager` conformance harness + persist/restore + orphan handling.
- [x] 3.4 `session-lifecycle.test.ts` — 15 scenarios covering FSM transitions, history, OTel emission.
- [x] 3.5 `player-manager.test.ts` — `IPlayerManager` conformance + heartbeat monitor + reconnection + grace eviction.
- [x] 3.6 Every `it(...)` carries `{ timeout: 5000 }`.

## 4. Documentation

- [x] 4.1 Sibling `.md` for every implementation `.ts` (6 docs: session-node, session-tree, session-store, session-lifecycle, player-manager, plus extended otel.md).
- [x] 4.2 `otel.md` updated with new instruments.

## 5. Pre-archive verification (the 5-gate triple)

- [x] 5.1 `bun run lint` — Biome 0 errors / 0 warnings.
- [x] 5.2 `bunx turbo lint typecheck test --filter=@suaveplan/game-server` — green (395 tests).
- [x] 5.3 `bunx turbo test:coverage --filter=@suaveplan/game-server` — 100/100/100/100 (1542/1542 stmts, 574/574 branches, 360/360 funcs, 1491/1491 lines).
- [ ] 5.4 `bun scripts/openspec-conformance.ts @suaveplan/game-server` — to be run by archive step.
- [ ] 5.5 `bunx turbo build --filter=@suaveplan/game-server` — to be run by archive step (orchestrator merges before build run).

## 6. Pre-archive 7-row checklist (AGENTS.md §13)

- [x] 6.1 Generics threaded; conformance harnesses pass for both interfaces.
- [x] 6.2 Zod schemas wired at `SessionData`, `SessionStoreOptions`, `PlayerManagerOptions` boundaries.
- [x] 6.3 Every new error code thrown by at least one production path and asserted in a test.
- [x] 6.4 Lifecycle path tested both for `ok` and `error` outcomes.
- [x] 6.5 OTel instruments emitted from production paths and asserted with the in-memory `MeterProvider` polyfill.
- [x] 6.6 Reconnection grace window + heartbeat monitor self-rescheduling tested.
- [x] 6.7 No retroactive tick — every box reflects work done in this change.

## 7. Archive

- [ ] 7.1 Fold spec delta into `openspec/specs/game-server/spec.md` — handled by orchestrator post-merge.
- [ ] 7.2 Move folder to archive — handled by orchestrator post-merge.
- [ ] 7.3 Refresh `MANIFEST.md` if package set changed (it did not — additive modules only).