Routing: Roger, Lincoln and @mentions

1. Roger posts an instant acknowledgment (no model call).
2. Roger’s model decides the intent and mode: answer (he replies himself), learn, quick, plan, implement, internal (settings and housekeeping) or clarify.
3. Lincoln writes a brief for the chosen specialist (lightly or fully improving your prompt) and dispatches it.
4. The specialist answers in the chat, with its thinking streamed live.

@Name skips steps 1-3 and goes straight to that agent. If Roger has no model, keyword routing is used and the acknowledgment says so.

Example: “How do I implement a function in Java?” in Coding goes to Prof in learn mode, unless your preferences say you want quick implementations.