agent: End turn at message boundary when queue has pending messages (#46980)

This feature cost $12

Release Notes:

- Changed the behavior of queued messages to gracefully wait for the
current activity to complete.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
f1a8b05391Mikayla Maki committed on 1/16/2026, 10:17:08 AM· committed by GitHubparent77bf7b7
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