Surfaces & Routing

Updated: 2025-12-07

Goal: make replies deterministic per channel while keeping one shared context for direct chats.

Surfaces (channel labels): whatsapp, webchat, telegram, voice, etc. Add Surface to inbound MsgContext so templates/agents can log which channel a turn came from. Routing is fixed: replies go back to the origin surface; the model doesn’t choose.
Canonical direct session: All direct chats collapse into the single main session by default (no config needed). Groups stay group:<jid>, so they remain isolated.
Session store: Keys are resolved via resolveSessionKey(scope, ctx, mainKey); the Tau JSONL path still lives under ~/.clawdis/sessions/<SessionId>.jsonl.
WebChat: Always attaches to main, loads the full Tau transcript so desktop reflects cross-surface history, and writes new turns back to the same session.
Implementation hints:
- Set Surface in each ingress (WhatsApp relay, WebChat bridge, future Telegram).
- Keep routing deterministic: originate → same surface. Use IPC/web senders accordingly.
- Do not let the agent emit “send to X” decisions; keep that policy in the host code.