Channel messages carry sender identity, giving the session provenance

Each channel notification wraps the text in a channel tag naming the source and carries meta with chat_id, message_id, user, user_id and a timestamp (telegram/server.ts around line 974). The session can therefore tell chat input from terminal input, and tell one sender from another. It cannot yet tell a human sender from an automated one.

This covers the actor.id part of provenance. Adding an explicit actor type (human, bot or relay) and the pairing date to meta would complete it for audit.