The one-shot from the session quick actions now also runs once when a
draft session becomes real, summarizing the opening message instead of
leaving the "Session N" placeholder.
Failures stay silent on this path: the user did not ask for a title, so
a busy runtime must not raise an error banner. A rename made while the
request is queued wins over its result.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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