Tak Hoffman ce71fac7d6
fix(slack): record app_mention retry key before dedupe check (#37033)
- Prime app_mention retry allowance before dedupe so near-simultaneous message/app_mention races do not drop valid mentions.
- Prevent duplicate dispatch when app_mention wins the race and message prepare later succeeds.
- Prune dispatched mention keys and add regression coverage for both dropped and successful in-flight message outcomes.

Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>
2026-03-05 21:47:52 -06:00
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