feat(mma): complete Phase 6 and finalize Comprehensive GUI UX track

- Implement Live Worker Streaming: wire ai_client.comms_log_callback to Tier 3 streams
- Add Parallel DAG Execution using asyncio.gather for non-dependent tickets
- Implement Automatic Retry with Model Escalation (Flash-Lite -> Flash -> Pro)
- Add Tier Model Configuration UI to MMA Dashboard with project TOML persistence
- Fix FPS reporting in PerformanceMonitor to prevent transient 0.0 values
- Update Ticket model with retry_count and dictionary-like access
- Stabilize Gemini CLI integration tests and handle script approval events in simulations
- Finalize and verify all 6 phases of the implementation plan

conductor/tracks/comprehensive_gui_ux_20260228/metadata.json

@@ -1,10 +1,10 @@
-{
+{
     "description":  "Enhance existing MMA orchestration GUI: tier stream panels, DAG editing, cost tracking, conductor lifecycle forms, track-scoped discussions, approval indicators, visual polish.",
     "track_id":  "comprehensive_gui_ux_20260228",
     "type":  "feature",
     "created_at":  "2026-03-01T08:42:57Z",
-    "status":  "refined",
-    "updated_at":  "2026-03-01T15:30:00Z",
+    "status":  "completed",
+    "updated_at":  "2026-03-01T20:15:00Z",
     "refined_by":  "claude-opus-4-6 (1M context)",
     "refined_from_commit":  "08e003a"
 }