docs(06-03): complete AI sync plan — heuristic+LLM show generation

- 06-03-SUMMARY.md: full plan documentation
- STATE.md: position advanced, decisions logged, session updated
- ROADMAP.md: phase 06 marked complete (3/3 plans)

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: executing
-stopped_at: Completed 06-ai-sync/06-02-PLAN.md
-last_updated: "2026-04-07T11:42:33.193Z"
+status: verifying
+stopped_at: Completed 06-ai-sync/06-03-PLAN.md
+last_updated: "2026-04-07T11:48:26.614Z"
 last_activity: 2026-04-07
 progress:
   total_phases: 7
-  completed_phases: 5
+  completed_phases: 6
   total_plans: 21
-  completed_plans: 20
+  completed_plans: 21
   percent: 0
 ---
 
@@ -27,7 +27,7 @@ See: .planning/PROJECT.md (updated 2026-04-05)
 
 Phase: 06 (ai-sync) — EXECUTING
 Plan: 3 of 3
-Status: Ready to execute
+Status: Phase complete — ready for verification
 Last activity: 2026-04-07
 
 Progress: [░░░░░░░░░░] 0%
@@ -72,6 +72,7 @@ Progress: [░░░░░░░░░░] 0%
 | Phase 05-live-show-execution P04 | 1 | 1 tasks | 1 files |
 | Phase 06-ai-sync P01 | 8 | 3 tasks | 6 files |
 | Phase 06-ai-sync P02 | 8 | 2 tasks | 7 files |
+| Phase 06-ai-sync P03 | 8 | 2 tasks | 5 files |
 
 ## Accumulated Context
 
@@ -128,6 +129,9 @@ Recent decisions affecting current work:
 - [Phase 06]: yt-dlp --newline flag required for line-by-line progress parsing
 - [Phase 06-ai-sync]: Segment band drawing inserted between row banding and waveform in render() for correct Z-order
 - [Phase 06-ai-sync]: Auto segment count: max(4, min(12, int(duration / 30))) for typical songs
+- [Phase 06-ai-sync]: Heuristic always available as baseline; LLM opt-in via use_llm flag (D-04)
+- [Phase 06-ai-sync]: LLM generates from scratch, not post-processing heuristic output (D-06)
+- [Phase 06-ai-sync]: anthropic imported lazily inside llm_generate to avoid startup crash without API key
 
 ### Pending Todos
 
@@ -141,8 +145,8 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-07T11:42:33.186Z
-Stopped at: Completed 06-ai-sync/06-02-PLAN.md
+Last session: 2026-04-07T11:48:26.607Z
+Stopped at: Completed 06-ai-sync/06-03-PLAN.md
 Resume file: None
 
 Next action: `/gsd:plan-phase 1`