feat(channels): add signal-cli channel adapter

README.md

@@ -6,7 +6,7 @@ Self-hosted personal AI assistant with Telegram and Terminal interfaces.
 
 - **Multi-Frontend**: Telegram bot + Terminal UI (minimal & fullscreen modes) + Web UI dashboard
 - **Multi-Model**: Anthropic Claude, OpenAI, GitHub Copilot, Gemini, Bedrock, Zhipu AI (GLM), xAI (Grok), Ollama, llama.cpp with intelligent routing
-- **Multi-Channel**: Telegram, Discord, Slack, WhatsApp with unified adapter interface
+- **Multi-Channel**: Telegram, Discord, Slack, WhatsApp, Matrix, and Signal with unified adapter interface
 - **Web Dashboard**: SPA control panel with health monitoring, chat, session browser, usage stats, and settings editor
 - **Model Switching**: Switch between cloud/local models on demand
 - **Session Persistence**: SQLite-backed conversation history
@@ -139,6 +139,17 @@ matrix:
   allowed_room_ids: ["!room1:example.org"]
   require_mention: true
 
+# Optional: Signal (signal-cli)
+signal:
+  account: "+15551234567"
+  signal_cli_path: "signal-cli"
+  allowed_numbers: ["+15550001111"]
+  allowed_group_ids: []
+  require_mention: true
+  mention_name: "flynn"
+  poll_interval_ms: 5000
+  send_timeout_ms: 15000
+
 models:
   default:
     provider: anthropic