fix: avoid scheduler registration deadlock

src/wf_api/runs.py

@@ -207,7 +207,7 @@ class WorkflowRunApi:
         # the gate.
         gate = self.resume_slot_gate
         if gate is not None:
-            slot = gate.acquire(run_id, owner_task=asyncio.current_task())
+            slot = await gate.acquire(run_id, owner_task=asyncio.current_task())
         else:
             slot = None
         slot_held = slot is not None
@@ -226,7 +226,7 @@ class WorkflowRunApi:
             # still live is reconciled for this run immediately, so its
             # ambiguous failure frees capacity without becoming retryable.
             if slot_held and gate is not None:
-                gate.reconcile_cancelled(run_id)
+                await gate.reconcile_cancelled(run_id)
             raise
         except BaseException:
             # Pre-persist errors, torn persists, and validation failures:
@@ -235,11 +235,11 @@ class WorkflowRunApi:
             # attempt / stopped result already captures the ambiguity for
             # recovery to reconcile by attempt identity.
             if slot_held and gate is not None:
-                gate.release(run_id)
+                await gate.release(run_id)
             raise
         else:
             if slot_held and gate is not None:
-                gate.release(run_id)
+                await gate.release(run_id)
             return result
 
     async def _resume_scheduled_or_manual(
@@ -352,7 +352,7 @@ class WorkflowRunApi:
         # quietly — restart recovery reconciles those instead.
         gate = self.resume_slot_gate
         if gate is not None:
-            gate.note_resumed_result(
+            await gate.note_resumed_result(
                 run_id,
                 status_value=run.status.value,
                 checkpoint_id=next_record.latest_checkpoint_id,