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openspec/changes/enterprise-gaming-lobby/proposal.md

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+# OpenSpec Change: enterprise-gaming-lobby
+
+- **Change ID**: enterprise-gaming-lobby
+- **Package**: `@suaveplan/lobby`
+- **Category**: gaming/multiplayer
+- **Target path**: `gaming/multiplayer/lobby`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/lobby.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/lobby` on the genesis branch from scratch at enterprise quality. The package provides multiplayer lobby management with matchmaking integration and countdown. A `LobbyManager` creates/destroys typed `Lobby` objects; a `Lobby` tracks member roster, ready state per member, configurable `minPlayers`/`maxPlayers`, game mode settings, and a `CountdownTimer`; when all members are ready, the countdown starts — on expiry the lobby fires `lobby:match_ready` and hands off to `@suaveplan/game-server`. Genesis adds Zod lobby config schemas, structured errors, OTel lobby-count gauge, injectable clock, and 100% coverage.
+
+---
+
+## Current-state audit (genesis)
+
+Package does not exist on genesis yet — fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | `LobbyError`; `LOBBY.*` codes |
+| `@suaveplan/types` (`workspace:^`) | `Clock`, `IdGenerator` |
+| `@suaveplan/events` (`workspace:^`) | `lobby:joined`, `lobby:left`, `lobby:ready`, `lobby:match_ready` events |
+| `zod` (`catalog:forms`) | `LobbyConfig`, `LobbyMember` schemas |
+| `@opentelemetry/api` (`catalog:observability`) | Active lobby gauge, match-ready counter |
+
+---
+
+## Public API surface
+
+```ts
+interface LobbyConfig {
+  gameMode: string
+  minPlayers: number
+  maxPlayers: number
+  countdownSeconds?: number   // default 5
+  settings?: Record<string, unknown>
+}
+
+interface LobbyMember {
+  playerId: string
+  displayName: string
+  isReady: boolean
+  joinedAt: number
+  isHost: boolean
+}
+
+function createLobbyManager(options?: { clock?: Clock }): LobbyManager
+
+interface LobbyManager {
+  createLobby(config: LobbyConfig): Lobby
+  getLobby(lobbyId: string): Lobby | undefined
+  destroyLobby(lobbyId: string): void
+  listLobbies(filter?: LobbyFilter): Lobby[]
+  readonly count: number
+}
+
+interface LobbyFilter {
+  gameMode?: string
+  hasOpenSlots?: boolean
+}
+
+interface Lobby {
+  readonly id: string
+  readonly config: LobbyConfig
+  readonly members: ReadonlyMap<string, LobbyMember>
+  readonly isCountingDown: boolean
+  readonly countdownRemaining: number
+  join(playerId: string, displayName: string): void
+  leave(playerId: string): void
+  setReady(playerId: string, ready: boolean): void
+  transferHost(toPlayerId: string): void
+  kick(playerId: string): void
+  tick(dt: number): void
+}
+```
+
+### Error codes
+
+```ts
+type LobbyErrorCode =
+  | 'LOBBY_NOT_FOUND'
+  | 'LOBBY_FULL'
+  | 'LOBBY_MEMBER_NOT_FOUND'
+  | 'LOBBY_ALREADY_JOINED'
+  | 'LOBBY_NOT_ENOUGH_PLAYERS'
+  | 'LOBBY_PERMISSION_DENIED'
+```
+
+---
+
+## File layout
+
+```text
+gaming/multiplayer/lobby/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    error-codes.ts
+    constants/index.ts
+    types/common.ts
+    types/common.md
+    core/
+      lobby/
+        lobby.ts
+        lobby.md
+        lobby.types.ts
+        lobby.test.ts
+        index.ts
+      lobby-manager/
+        lobby-manager.ts
+        lobby-manager.md
+        lobby-manager.types.ts
+        lobby-manager.test.ts
+        index.ts
+  tests/
+    integration.test.ts
+```
+
+---
+
+## Impact
+
+**Downstream**: `@suaveplan/party` shares member management patterns; `@suaveplan/api-plugin-matchmaking` creates lobbies when a match is found. Prerequisites: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`.