feat(core): dispatch durable dataflow runs

tests/test_dataflow_contract.py

@@ -4,9 +4,12 @@ import unittest
 
 from govoplan_core.core.dataflows import (
     CAPABILITY_DATAFLOW_RUN_LIFECYCLE,
+    CAPABILITY_DATAFLOW_RUN_WORKER,
     DataflowRunDescriptor,
     DataflowRunLifecycleProvider,
+    DataflowRunWorker,
     dataflow_run_lifecycle,
+    dataflow_run_worker,
 )
 from govoplan_core.core.modules import ModuleContext, ModuleManifest
 from govoplan_core.core.registry import PlatformRegistry
@@ -49,10 +52,27 @@ class _Provider:
         )
 
 
+class _Worker:
+    def dispatch_pending(
+        self,
+        session,
+        *,
+        now=None,
+        limit=10,
+        worker_id=None,
+    ):
+        return {"claimed": 0}
+
+    def purge_expired(self, session, *, now=None, limit=500):
+        return {"purged": 0}
+
+
 class DataflowContractTests(unittest.TestCase):
     def test_run_lifecycle_is_runtime_checkable_and_resolved(self) -> None:
         provider = _Provider()
+        worker = _Worker()
         self.assertIsInstance(provider, DataflowRunLifecycleProvider)
+        self.assertIsInstance(worker, DataflowRunWorker)
         registry = PlatformRegistry()
         registry.register(
             ModuleManifest(
@@ -61,6 +81,7 @@ class DataflowContractTests(unittest.TestCase):
                 version="test",
                 capability_factories={
                     CAPABILITY_DATAFLOW_RUN_LIFECYCLE: lambda context: provider,
+                    CAPABILITY_DATAFLOW_RUN_WORKER: lambda context: worker,
                 },
             )
         )
@@ -69,7 +90,9 @@ class DataflowContractTests(unittest.TestCase):
         )
 
         self.assertIs(provider, dataflow_run_lifecycle(registry))
+        self.assertIs(worker, dataflow_run_worker(registry))
         self.assertIsNone(dataflow_run_lifecycle(PlatformRegistry()))
+        self.assertIsNone(dataflow_run_worker(PlatformRegistry()))
 
 
 if __name__ == "__main__":