docs(04-04): complete audio wiring plan

- SUMMARY.md with all task commits and decisions
- STATE.md updated to 100% progress, phase 04 complete
- ROADMAP.md updated with plan progress

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: executing
-stopped_at: Completed 04-01-PLAN.md
-last_updated: "2026-03-29T16:19:56.987Z"
+status: verifying
+stopped_at: Completed 04-04-PLAN.md
+last_updated: "2026-03-29T16:23:36.957Z"
 last_activity: 2026-03-29
 progress:
   total_phases: 4
-  completed_phases: 3
+  completed_phases: 4
   total_plans: 19
-  completed_plans: 18
+  completed_plans: 19
   percent: 0
 ---
 
@@ -27,7 +27,7 @@ See: .planning/PROJECT.md (updated 2026-03-29)
 
 Phase: 04 (polish-audio) — EXECUTING
 Plan: 4 of 4
-Status: Ready to execute
+Status: Phase complete — ready for verification
 Last activity: 2026-03-29
 
 Progress: [░░░░░░░░░░] 0%
@@ -70,6 +70,7 @@ Progress: [░░░░░░░░░░] 0%
 | Phase 04 P02 | 2min | 2 tasks | 3 files |
 | Phase 04 P03 | 2min | 2 tasks | 3 files |
 | Phase 04 P01 | 4min | 2 tasks | 9 files |
+| Phase 04 P04 | 1min | 2 tasks | 4 files |
 
 ## Accumulated Context
 
@@ -109,6 +110,7 @@ Recent decisions affecting current work:
 - [Phase 04]: Export excludes Blobs (only progress+settings) for JSON portability
 - [Phase 04]: speechEnabled defaults to false (opt-in), audioEnabled defaults to true (opt-out)
 - [Phase 04]: AudioContext lazy init on first user interaction for autoplay policy compliance
+- [Phase 04]: Audio calls are fire-and-forget at all touch points -- sound/speech modules handle settings checks and errors internally
 
 ### Pending Todos
 
@@ -120,6 +122,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-29T16:19:56.980Z
-Stopped at: Completed 04-01-PLAN.md
+Last session: 2026-03-29T16:23:36.950Z
+Stopped at: Completed 04-04-PLAN.md
 Resume file: None