docs(06-01): complete YouTube audio loading plan

- Create 06-01-SUMMARY.md with full execution details
- Update STATE.md: advance to plan 2, 90% progress, add decisions
- Update ROADMAP.md: phase 6 showing 1/3 plans complete

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: executing
-stopped_at: Completed 05-live-show-execution/05-04-PLAN.md
-last_updated: "2026-04-07T10:41:51.205Z"
+stopped_at: Completed 06-ai-sync/06-01-PLAN.md
+last_updated: "2026-04-07T11:38:05.324Z"
 last_activity: 2026-04-07
 progress:
   total_phases: 7
   completed_phases: 5
-  total_plans: 18
-  completed_plans: 18
+  total_plans: 21
+  completed_plans: 19
   percent: 0
 ---
 
@@ -21,12 +21,12 @@ progress:
 See: .planning/PROJECT.md (updated 2026-04-05)
 
 **Core value:** Load a song, build a synchronized light show, play it back live — with precise control over every effect on every device.
-**Current focus:** Phase 05 — live-show-execution
+**Current focus:** Phase 06 — ai-sync
 
 ## Current Position
 
-Phase: 6
-Plan: Not started
+Phase: 06 (ai-sync) — EXECUTING
+Plan: 2 of 3
 Status: Ready to execute
 Last activity: 2026-04-07
 
@@ -70,6 +70,7 @@ Progress: [░░░░░░░░░░] 0%
 | 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 |
+| Phase 06-ai-sync P01 | 8 | 3 tasks | 6 files |
 
 ## Accumulated Context
 
@@ -122,6 +123,8 @@ Recent decisions affecting current work:
 - [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
+- [Phase 06-ai-sync]: sys.executable -m yt_dlp used to avoid PATH issues in Docker container
+- [Phase 06]: yt-dlp --newline flag required for line-by-line progress parsing
 
 ### Pending Todos
 
@@ -135,8 +138,8 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-07T10:38:10.089Z
-Stopped at: Completed 05-live-show-execution/05-04-PLAN.md
+Last session: 2026-04-07T11:37:58.939Z
+Stopped at: Completed 06-ai-sync/06-01-PLAN.md
 Resume file: None
 
 Next action: `/gsd:plan-phase 1`