docs: document multi-agent mode

docs/index.md

@@ -64,6 +64,7 @@ Most operations flow through the **Gateway** (`clawdbot gateway`), a single long
 - 🎮 **Discord Bot** — DMs + guild channels via discord.js
 - 💬 **iMessage** — Local imsg CLI integration (macOS)
 - 🤖 **Agent bridge** — Pi (RPC mode) with tool streaming
+- 🧠 **Multi-agent routing** — Route provider accounts/peers to isolated agents (workspace + per-agent sessions)
 - 🔐 **Subscription auth** — Anthropic (Claude Pro/Max) + OpenAI (ChatGPT/Codex) via OAuth
 - 💬 **Sessions** — Direct chats collapse into shared `main` (default); groups are isolated
 - 👥 **Group Chat Support** — Mention-based by default; owner can toggle `/activation always|mention`
@@ -131,6 +132,7 @@ Example:
   - [Docs hubs (all pages linked)](https://docs.clawd.bot/hubs)
   - [FAQ](https://docs.clawd.bot/faq) ← *common questions answered*
   - [Configuration](https://docs.clawd.bot/configuration)
+  - [Multi-agent routing](https://docs.clawd.bot/multi-agent)
   - [Updating / rollback](https://docs.clawd.bot/updating)
   - [Pairing (DM + nodes)](https://docs.clawd.bot/pairing)
   - [Nix mode](https://docs.clawd.bot/nix)