feat: implement tier-a4 tts voice output replies

docs/plans/state.json

@@ -5225,6 +5225,26 @@
         "docs/plans/state.json"
       ],
       "test_status": "Docs-only change (no code paths affected)"
+    },
+    "tts-voice-output-tier-a4": {
+      "status": "completed",
+      "date": "2026-02-18",
+      "updated": "2026-02-18",
+      "summary": "Implemented Tier A4 voice output: added configurable OpenAI-compatible TTS (`tts.*`) and integrated channel-gated synthesized reply attachments in daemon routing for both native and external backend responses, with unit/integration tests and docs updates.",
+      "files_modified": [
+        "src/models/tts.ts",
+        "src/models/tts.test.ts",
+        "src/models/index.ts",
+        "src/config/schema.ts",
+        "src/config/index.ts",
+        "src/config/schema.test.ts",
+        "src/daemon/routing.ts",
+        "src/daemon/routing.test.ts",
+        "README.md",
+        "config/default.yaml",
+        "docs/plans/state.json"
+      ],
+      "test_status": "pnpm test:run src/models/tts.test.ts src/config/schema.test.ts src/daemon/routing.test.ts + pnpm typecheck passing"
     }
   },
   "overall_progress": {
@@ -5248,7 +5268,7 @@
     "gmail_auth_cli": "flynn gmail-auth command implemented with OAuth2 flow, doctor check, config routed to Telegram",
     "native_audio_support": "completed — smart routing for native audio (Gemini/OpenAI/GitHub) vs Whisper transcription fallback",
     "remaining_phases_completion": "Phase 1: 3/3 (100%) — context levels, command registry, memory structure. Phase 2: 3/3 (100%) — component registry, confidence routing, history index. Phase 3: 2/2 (100%) — adaptive memory/compaction, truthfulness/autonomy hardening",
-    "next_up": "Implement Tier A4 from the OpenClaw roadmap: TTS voice output with channel-aware audio responses"
+    "next_up": "Implement the reactions/event-trigger automation layer from the OpenClaw roadmap (event pattern matching -> agent action execution)"
   },
   "soul_md_and_cron_create": {
     "date": "2026-02-11",