assistant2: Add `Thread::send_to_model` method (#25703)

This PR adds a new `send_to_model` method to the `Thread` to encapsulate
more of the thread-specific capabilities.

We then call this in `MessageEditor::send_to_model`.

Release Notes:

- N/A
9822d9673cMarshall Bowers committed on 2/27/2025, 12:16:44 AM· committed by GitHubparentf0dec2f
2 files changedLine totals unavailable