docs: complete Epic 2 — Story 2.3 keep-playing verified, no code changes

All Story 2.3 ACs already satisfied by Stories 1.2, 1.6, and 2.2.
Keep-playing mode works: flag persists across sessions, win overlay
suppressed, game over still triggers. Epic 2 done.

_bmad-output/implementation-artifacts/2-3-keep-playing-mode.md

@@ -0,0 +1,67 @@
+# Story 2.3: Keep Playing Mode
+
+Status: done
+
+## Story
+
+As a player,
+I want to continue playing after reaching 2048,
+so that I can push for higher tiles and a bigger score.
+
+## Acceptance Criteria
+
+1. After clicking "Keep going", the keepPlaying flag is set to true and subsequent 2048+ merges do not trigger the win overlay again
+2. After closing and reopening the app in keep-playing mode, the game restores with keepPlaying: true and no win overlay
+3. In keep-playing mode with no valid moves, the game over overlay appears normally
+
+## Tasks / Subtasks
+
+- [x] Task 1: Verify keepPlaying flag behavior (AC: #1)
+  - [x] `handleKeepGoing()` sets `keepPlaying: true` in gameState (implemented in Story 1.6)
+  - [x] `overlayType` checks `!gameState.keepPlaying` — win overlay only shows when keepPlaying is false (Story 1.6)
+  - [x] `game-logic.js` move() win check: `!won && !state.keepPlaying` prevents re-trigger (Story 1.2)
+
+- [x] Task 2: Verify persistence of keepPlaying (AC: #2)
+  - [x] `saveGameState` includes `keepPlaying` in serialized state (Story 2.2)
+  - [x] `loadGameState` restores `keepPlaying` from localStorage (Story 2.2)
+  - [x] On restore with `keepPlaying: true` and `won: true`, overlayType evaluates to null — no win overlay
+
+- [x] Task 3: Verify game over in keep-playing mode (AC: #3)
+  - [x] `overlayType` checks `isGameOver(gameState)` regardless of keepPlaying — gameover overlay shows normally
+
+- [x] Task 4: Run full test suite
+  - [x] All 49 tests pass — no code changes needed for this story
+
+## Dev Notes
+
+### Architecture Compliance
+
+All Story 2.3 acceptance criteria were already satisfied by prior stories:
+- **Story 1.2:** Game logic win detection respects keepPlaying flag
+- **Story 1.6:** handleKeepGoing, overlayType derived, GameMessage overlay
+- **Story 2.2:** localStorage persistence of full game state including keepPlaying
+
+No code changes required — this story is verification-only.
+
+### References
+
+- [Source: _bmad-output/planning-artifacts/epics.md#Story 2.3]
+
+## Dev Agent Record
+
+### Agent Model Used
+
+Claude Opus 4.6 (1M context)
+
+### Debug Log References
+
+### Completion Notes List
+
+- All 3 ACs verified against existing implementation — no code changes needed
+- keepPlaying flag flow: handleKeepGoing → saveGameState → loadGameState → overlayType check
+- Win re-trigger prevented by game-logic.js condition: `!won && !state.keepPlaying`
+- 49 tests passing, no regressions
+
+### File List
+
+- (no files changed — verification-only story)

_bmad-output/implementation-artifacts/sprint-status.yaml

@@ -35,7 +35,7 @@
 # - Dev moves story to 'review', then runs code-review (fresh context, different LLM recommended)
 
 generated: 2026-04-13
-last_updated: 2026-04-13T22:33:00
+last_updated: 2026-04-13T22:44:00
 project: try-bmad
 project_key: NOKEY
 tracking_system: file-system
@@ -53,10 +53,10 @@ development_status:
   epic-1-retrospective: optional
 
   # Epic 2: Save Progress & Keep Playing
-  epic-2: in-progress
+  epic-2: done
   2-1-best-score-tracking: done
   2-2-game-state-persistence: done
-  2-3-keep-playing-mode: backlog
+  2-3-keep-playing-mode: done
   epic-2-retrospective: optional
 
   # Epic 3: Smooth Animations & Game Feel