Reviewer feedback on #92318:
1. Bounded overshoot in the commit-in-flight branch is now documented at
the await site — the turn can exceed _hyg_max_turn_hold_seconds by up
to commit duration, and aborting mid-commit would corrupt the
message-store transaction. Prevents a future 'fix' into mid-commit
cancellation.
2. The user-facing 'Context compression deferred' bubble now routes
through t() as gateway.compress.turnhold_deferred (en.yaml entry
added), coordinating with the i18n surface expanding in #92338 so
non-English users don't get hardcoded English copy.
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