fix: close scheduler persistence and capacity gaps

src/wf_api/schedules.py

@@ -110,6 +110,23 @@ class WorkflowScheduleApi:
             raise KeyError("workflow schedule store is not configured")
         return store
 
+    def bind_schedule_store(self, store: Any) -> None:
+        """Bind the composition-owned schedule store exactly once.
+
+        Server composition uses this seam when the scheduler is enabled on a
+        server that was built without the optional schedule surface. Refuse
+        to replace an already configured store: API and scheduler writes must
+        remain on one same-process lock and one durable root.
+        """
+        if self._explicit_schedule_store is not None:
+            if self._explicit_schedule_store is not store:
+                raise ValueError("workflow schedule store is already configured")
+            return
+        context_store = getattr(self.context, "schedule_store", None)
+        if context_store is not None and context_store is not store:
+            raise ValueError("workflow schedule store is already configured")
+        self._explicit_schedule_store = store
+
     def _artifact_store(self) -> Any:
         if self.context.artifact_store is None:
             raise KeyError("workflow artifact store is not configured")