sched: add startup recovery that never executes work (T10)

src/wf_scheduling/poll.py

@@ -125,10 +125,15 @@ class Scheduler:
         return admission.schedule_id
 
     def _task_load(self) -> int:
+        from wf_scheduling.recovery import _is_pending
+
         count = 0
         for run in self.run_store.list_runs():
-            if self._status_value(run) == "admitted":
-                count += 1
+            if self._status_value(run) != "admitted":
+                continue
+            if _is_pending(self.run_store, run.id):
+                continue
+            count += 1
         return count
 
     def _record(
@@ -374,15 +379,15 @@ class Scheduler:
     def _dispatch_pending(self, now: datetime) -> None:
         """Dispatch recovery-materialized runs through capacity checks.
 
-        Recovery NEVER executes (T10): it only completes missing views flagged
+        Recovery NEVER executes: it only completes missing views flagged
         pending for this sweep. Pending runs of blocked schedules stay
-        pending. F11 is descoped to T10 here: the pending-dispatch marker does
-        not exist yet, so only runs explicitly flagged ``needs_dispatch``
-        dispatch in this sweep and hanging admitted runs are never
-        re-executed.
+        pending. Hanging admitted runs without a pending marker are never
+        re-executed here.
         """
+        from wf_scheduling.recovery import _is_pending, clear_pending
+
         for run in sorted(self.run_store.list_runs(), key=lambda r: r.id):
-            if not getattr(run, "needs_dispatch", False):
+            if not _is_pending(self.run_store, run.id):
                 continue
             try:
                 admission = self.run_store.get_admission(run.id)
@@ -399,6 +404,7 @@ class Scheduler:
             if self._task_load() >= self.capacity:
                 continue
             self._dispatch(run.id, now)
+            clear_pending(self.run_store, run.id)
 
     def _poll_one(self, sched: Any, now: datetime) -> str:
         if sched.deleted: