Add admin sync hot reload path

src/activity_core/api.py

@@ -40,6 +40,7 @@ from temporalio.client import Client
 from activity_core.models import ActivityDefinition, CronTriggerConfig
 from activity_core.orm import ActivityDefinition as ActivityDefinitionRow, EventType as EventTypeRow
 from activity_core.schedule_manager import delete_schedule, upsert_schedule
+from activity_core.sync_service import run_sync
 from activity_core.webhook_receiver import router as webhook_router
 
 TEMPORAL_HOST = os.environ.get("TEMPORAL_HOST", "localhost:7233")
@@ -275,6 +276,24 @@ async def trigger_definition(definition_id: uuid.UUID) -> dict[str, str]:
     return {"workflow_id": handle.id, "trigger_key": trigger_key}
 
 
+# --- Admin sync ---------------------------------------------------------------
+
+@app.post("/admin/sync")
+async def admin_sync(
+    definitions: bool = True,
+    schedules: bool = True,
+    event_types: bool = False,
+) -> dict[str, Any]:
+    """Run operator-triggered definition/event/schedule sync without restart."""
+    return await run_sync(
+        session_factory=_get_db(),
+        temporal_client=_get_temporal() if schedules else None,
+        definitions=definitions,
+        schedules=schedules,
+        event_types=event_types,
+    )
+
+
 # T42: Curator gate — event type approval endpoint
 
 @app.get("/health")