docs(plans): record Matrix adapter completion

README.md

@@ -102,6 +102,13 @@ telegram:
   bot_token: "your-telegram-bot-token"
   allowed_chat_ids: [123456789]  # Your Telegram user ID
 
+# Optional: Matrix
+matrix:
+  homeserver_url: "https://matrix.example.org"
+  access_token: "${MATRIX_ACCESS_TOKEN}"
+  allowed_room_ids: ["!room1:example.org"]
+  require_mention: true
+
 models:
   default:
     provider: anthropic
@@ -818,7 +825,7 @@ src/
 ├── agents/               # Multi-agent routing
 ├── auth/                 # OAuth flows (GitHub Copilot)
 ├── backends/native/      # Agent implementation + orchestrator
-├── channels/             # Channel adapters (Telegram, Discord, Slack, WhatsApp, WebChat)
+├── channels/             # Channel adapters (Telegram, Discord, Slack, WhatsApp, Matrix, WebChat)
 │   └── pairing.ts        # DM pairing code manager
 ├── cli/                  # CLI commands (commander)
 │   └── completion.ts     # Shell completion generator (bash/zsh/fish)