* fix(cron): prevent duplicate proactive delivery on transient retry
* refactor: scope skipQueue to retryTransient path only
Non-retrying direct delivery (structured content / thread) keeps the
write-ahead queue so recoverPendingDeliveries can replay after a crash.
Addresses review feedback from codex-connector.
* fix: preserve write-ahead queue on initial delivery attempt
The first call through retryTransientDirectCronDelivery now keeps the
write-ahead queue entry so recoverPendingDeliveries can replay after a
crash. Only subsequent retry attempts set skipQueue to prevent
duplicate sends.
Addresses second codex-connector review on ea5ae5c.
* ci: retrigger checks
* Cron: bypass write-ahead queue for direct isolated delivery
* Tests: assert isolated cron skipQueue invariants
* Changelog: add cron duplicate-delivery fix entry
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Co-authored-by: Vincent Koc <vincentkoc@ieee.org>
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