A pick queued mid-turn that the selection guard refuses (or that fails to
apply) at the next turn start was emitted as a session 'error'. Desktop paints
that as the red 'couldn't finish this reply' card with Retry under the user's
message, while the turn then runs normally on the old model: an error that
'confusingly succeeds'. Emit a warn notice instead and re-sync session.info so
the composer pill leaves the pick the session never adopted.
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