sched: remediate R4 ownership, identity-match, dispatch-mark, and pending atomicity

src/wf_scheduling/poll.py

@@ -310,8 +310,21 @@ class Scheduler:
         self.schedule_store.save_consumed(sched.id, intended)
         from wf_api.run_lifecycle import materialize_admitted_view
 
+        # Dispatch mark precedes the view so a crash after admission but
+        # before/during first dispatch stays pending (not abandoned). Cleared
+        # after dispatch returns regardless of outcome (hang still dispatched).
+        try:
+            self.run_store.mark_pending_dispatch(run_id)
+        except AttributeError:
+            pass
         materialize_admitted_view(store=self.run_store, admission=admission)
-        self._dispatch(run_id, now)
+        try:
+            self._dispatch(run_id, now)
+        finally:
+            try:
+                self.run_store.clear_pending_dispatch(run_id)
+            except AttributeError:
+                pass
         return run_id
 
     def _dispatch(self, run_id: str, now: datetime) -> None: