docs(explore-notes): document stale-Running chain/parent advance fix

Bump worker-task-pipeline verified-against commit to 58741c2.

docs/explore-notes/worker-task-pipeline.md

@@ -1,6 +1,6 @@
 > **Explore-note — verify before trusting.** Distilled map of a subsystem, not authoritative.
-> Last verified against commit `896d4b5` (2026-07-23).
-> Drift check: `git log --oneline 896d4b5..HEAD -- src/ClaudeDo.Worker`
+> Last verified against commit `58741c2` (2026-08-06).
+> Drift check: `git log --oneline 58741c2..HEAD -- src/ClaudeDo.Worker`
 > Stable structure only (no line numbers). See docs/explore-notes/README.md.
 
 # Worker: Task Execution Pipeline
@@ -108,7 +108,11 @@ read-only "## Reference files" section.
 - `TaskStateService` — all task status transitions; guards preconditions; signals queue/hub.
 
 **Lifecycle/** (startup recovery)
-- `StaleTaskRecovery` — tasks stuck Running after a crash/restart → Failed.
+- `StaleTaskRecovery` — tasks stuck Running after a crash/restart → Failed. The underlying
+  `TaskStateService.RecoverStaleRunningAsync` bulk-flips Running→Failed, then re-runs the same
+  chain/parent-advance side effects as a normal `FailAsync` (per recovered id, best-effort) so a
+  crash mid-chain-child or mid-improvement-child doesn't leave a successor blocked forever or a
+  `WaitingForChildren` parent wedged.
 - `OrphanRecovery` — dequeues children whose parent is no longer planning (stays attached).
 - `AttachmentOrphanRecovery` — cleans orphaned attachment files.
 - `TaskResetService` — manual reset to Idle.