* fix(dispatch): stop burning breaker strikes on dependency-held blocked tasks; collision notify rides the delegate transaction
Two follow-ups from the 2026-07-29 blocked-task wave:
- _dispatch_blocker_work now skips a blocked task whose dependencies are
non-terminal BEFORE the respawn gate. spawn_agent's readiness gate was
refusing these anyway, but each refused attempt burned a respawn-
breaker strike and, once tripped at 4, a duplicate CEO escalation
every tick (seen live on the eslint-audit task held behind a paused
backend dependency). The dispatcher re-checks each tick and proceeds
the moment the dependency goes terminal — same resume path as before,
minus the noise.
- send_collision_sequencing_notification gains the db_session threading
its sibling senders already have, and TaskService passes its own
session. delegate wires collision edges inside a transaction whose
held-back child row is not yet committed; the notification INSERT ran
on a separate auto-commit connection and died on the related_task_id
FK (ForeignKeyViolationError seen live in cell_pm/delegate), silently
losing the coordination alert. Riding the caller's transaction makes
the row visible and commits both atomically.
* test(notification): cast the fake session for the gate's tests-scope mypy
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Co-authored-by: Renn F <rennf93@users.noreply.github.com>
