Models: a group session whose model selection failed is never repaired (applyModel early return); old 'no model set up' lines stay in room history #289

applyModel() (core/src/host/models.js) returns early when bot.appliedModel === ref and the effort matches. It sets appliedModel after the Bot's own chat Session is selected even when selecting a group Session failed (that failure is only a warning), and room-participant.js open() swallows a failed first selection the same way. So a group Session left on the wrong or fallback model is never repaired by syncAll() (served-models change), by restart, or by the next turn.

Fix: a failed group selection marks the Bot modelStale, applyModel does not short-circuit while it is set (and clears it once every Session took the model), and open() retries before using a known group Session of a stale Bot.

Also seen: old "no model set up" failure lines stay in a room's history after the model is fixed. That is history, not state; recorded here, not changed.