docs(05-04): complete mouse play/pause WS fix plan — SUMMARY, STATE, ROADMAP updated

- 05-04-SUMMARY.md: gap closure complete, UDP cues fire for mouse playback
- STATE.md: plan advanced to 2/4, progress 100%, decision logged
- ROADMAP.md: Phase 05 marked Complete (4/4 plans)

.planning/ROADMAP.md

@@ -112,7 +112,7 @@ Plans:
 - [x] 05-01-PLAN.md — Cue scheduler: server-side position-driven scheduling, 60ms look-ahead, seek-safe fired_ids reset
 - [x] 05-02-PLAN.md — Live preview panel + show selector: DOM device strips, preview_update handler, show load into timeline
 - [x] 05-03-PLAN.md — Keyboard shortcuts: Space, arrows, Ctrl+Z/Y/S for mouse-free operation
-- [ ] 05-04-PLAN.md — Gap closure: wire WebSocket play/pause messages from mouse transport button
+- [x] 05-04-PLAN.md — Gap closure: wire WebSocket play/pause messages from mouse transport button
 **UI hint**: yes
 
 ### Phase 6: AI Sync
@@ -157,6 +157,6 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
 | 2. Audio Engine | 3/3 | Complete   | 2026-04-06 |
 | 3. Communication Protocol | 3/3 | Complete   | 2026-04-06 |
 | 4. Timeline Editor | 4/4 | Complete   | 2026-04-06 |
-| 5. Live Show Execution | 3/3 | Complete   | 2026-04-07 |
+| 5. Live Show Execution | 4/4 | Complete   | 2026-04-07 |
 | 6. AI Sync | 0/3 | Not started | - |
 | 7. Microcontroller Firmware | 0/3 | Not started | - |

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: verifying
+status: executing
-stopped_at: Completed 05-live-show-execution/05-03-PLAN.md
+stopped_at: Completed 05-live-show-execution/05-04-PLAN.md
-last_updated: "2026-04-07T10:19:03.026Z"
+last_updated: "2026-04-07T10:38:10.097Z"
 last_activity: 2026-04-07
 progress:
   total_phases: 7
   completed_phases: 5
-  total_plans: 17
+  total_plans: 18
-  completed_plans: 17
+  completed_plans: 18
   percent: 0
 ---
 
@@ -26,8 +26,8 @@ See: .planning/PROJECT.md (updated 2026-04-05)
 ## Current Position
 
 Phase: 05 (live-show-execution) — EXECUTING
-Plan: 3 of 3
+Plan: 2 of 4
-Status: Phase complete — ready for verification
+Status: Ready to execute
 Last activity: 2026-04-07
 
 Progress: [░░░░░░░░░░] 0%
@@ -69,6 +69,7 @@ Progress: [░░░░░░░░░░] 0%
 | Phase 05-live-show-execution P01 | 152 | 2 tasks | 1 files |
 | Phase 05-live-show-execution P02 | 20 | 2 tasks | 3 files |
 | Phase 05-live-show-execution P03 | 10 | 1 tasks | 1 files |
+| Phase 05-live-show-execution P04 | 1 | 1 tasks | 1 files |
 
 ## Accumulated Context
 
@@ -120,6 +121,7 @@ Recent decisions affecting current work:
 - [Phase 05-live-show-execution]: e.preventDefault() called first in every key branch — suppresses browser defaults before app logic
 - [Phase 05-live-show-execution]: Space on button elements explicitly skipped — prevents double-toggle with native button click
 - [Phase 05-live-show-execution]: Ctrl+S uses GET-then-POST round-trip to save current server show state, not in-memory timeline
+- [Phase 05-live-show-execution]: Audio element event listeners are correct hook for mouse play/pause WS messages — fire for all triggers (button/keyboard/programmatic), idempotent with wireKeyboard() sends
 
 ### Pending Todos
 
@@ -133,8 +135,8 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-07T10:19:03.021Z
+Last session: 2026-04-07T10:38:10.089Z
-Stopped at: Completed 05-live-show-execution/05-03-PLAN.md
+Stopped at: Completed 05-live-show-execution/05-04-PLAN.md
 Resume file: None
 
 Next action: `/gsd:plan-phase 1`

.planning/phases/05-live-show-execution/05-04-SUMMARY.md

@@ -0,0 +1,98 @@
+---
+phase: 05-live-show-execution
+plan: 04
+subsystem: ui
+tags: [websocket, audio, playback, frontend, javascript]
+
+# Dependency graph
+requires:
+  - phase: 05-live-show-execution/05-03
+    provides: wireKeyboard() with WS play/pause already working for keyboard shortcuts
+  - phase: 05-live-show-execution/05-01
+    provides: WebSocket cue scheduler with is_playing gate and UDP dispatch
+provides:
+  - Mouse-initiated play/pause now sends WebSocket messages to server
+  - Server is_playing flag correctly set for both mouse and keyboard playback
+  - UDP cue scheduler fires for mouse-triggered playback
+affects: [05-live-show-execution]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "audio element 'play'/'pause' event listeners send WS messages alongside UI updates — same pattern as wireKeyboard()"
+
+key-files:
+  created: []
+  modified:
+    - lightsync/frontend/app.js
+
+key-decisions:
+  - "Audio element event listeners are the correct hook for mouse play/pause — they fire for all triggers (button click, keyboard, programmatic), so WS messages are sent exactly once regardless of source"
+
+patterns-established:
+  - "Idempotent WS messages: both wireAudio() and wireKeyboard() send play/pause — harmless because server handlers set a boolean flag"
+
+requirements-completed: [SHW-03, UI-03, UI-04]
+
+# Metrics
+duration: 1min
+completed: 2026-04-07
+---
+
+# Phase 05 Plan 04: Mouse Play/Pause WebSocket Fix Summary
+
+**Audio element event listeners now forward play/pause state to server via WebSocket, enabling UDP cue scheduling for mouse-initiated playback**
+
+## Performance
+
+- **Duration:** ~1 min
+- **Started:** 2026-04-07T10:36:50Z
+- **Completed:** 2026-04-07T10:37:27Z
+- **Tasks:** 1
+- **Files modified:** 1
+
+## Accomplishments
+
+- Added `client.send({ type: 'play', position: audio.currentTime })` to the `audio 'play'` event listener in `wireAudio()`
+- Added `client.send({ type: 'pause', position: audio.currentTime })` to the `audio 'pause'` event listener in `wireAudio()`
+- Server `is_playing` flag now becomes `True` when playback is started via the transport bar mouse button
+- UDP cue scheduler (LOOKAHEAD=60ms) now fires animation commands for mouse-initiated shows, not just keyboard Space shortcut
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Add WebSocket play/pause messages to wireAudio() event listeners** - `ac0f3d5` (feat)
+
+**Plan metadata:** (docs commit follows)
+
+## Files Created/Modified
+
+- `lightsync/frontend/app.js` — Added client.send() calls to 'play' and 'pause' event listeners in wireAudio() (lines 135-136)
+
+## Decisions Made
+
+Audio element event listeners ('play'/'pause') are the correct hook rather than modifying the button click handler. These events fire for ALL triggers — button click, keyboard shortcuts, or programmatic `audio.play()`/`audio.pause()` calls — ensuring the WS message fires exactly once per state change. Both wireAudio() and wireKeyboard() sending the same WS messages is harmless: the server handlers are idempotent (they set `is_playing` to a boolean value).
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- Gap closure complete: mouse play/pause now correctly triggers server-side cue scheduling
+- All 11 truths from Phase 05 verification should now be satisfied (previously 9/11)
+- Phase 05 live-show-execution is fully complete
+
+---
+*Phase: 05-live-show-execution*
+*Completed: 2026-04-07*