Ancestor-reopen descendant invalidation previously lived only in the
dashboard plugin (_set_status_direct), so board semantics diverged by
surface and the retraction was silent: completed work snapped back to
todo and live workers were killed with no operator-visible signal.
Move it into kanban_db.invalidate_descendants_for_parent_reopen as THE
single domain implementation (recursive-CTE discovery and per-run
_retry_status_for_run handling preserved). It composes under a caller's
open transaction via write_txn(allow_nested=True) — the ancestor flip
and the descendant retractions must commit atomically — and opens its
own transaction standalone. The dashboard shim now delegates; the CLI
deliberately has no done-reopen verb (reopen-review is review-phase
only), so the DB-layer function being the single implementation is the
fix, documented in its docstring.
Non-silent: every invalidated descendant gets a descendant_invalidated
event ({ancestor, prior_status, new_status, resume_status}), the legacy
status event for existing live-feed consumers, and a task comment
naming the reopened ancestor. Running descendants keep the termination
behavior (a child building on a retracted premise is wasted spend), but
the events/comment are committed BEFORE the kill, which routes through
_terminate_reclaimed_worker — the same helper the reclaim paths use.
consecutive_failures resets to 0 on invalidated descendants: operator-
initiated invalidation is a deliberate fresh start, deliberately the
opposite of the review-loop rule (reopen_review_task preserves the
counter, #35072) so the autonomous review loop can't launder its own
failure streak.
Regression: DB-function reopen demotes done descendants with events +
comments; running descendant's audit trail is durable before its worker
dies; counter resets; dashboard and DB paths produce identical task
states, event kinds, and comment counts.
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