fix: opt draft storage into real callers

tests/wf_mcp/server/test_tools.py

@@ -101,7 +101,7 @@ async def test_registered_output_bindings_tool_delegates_typed_bindings_once(
     recorder = RecordingWorkflowHandler()
     monkeypatch.setattr(
         "wf_mcp.workflow_surface.tools.WorkflowApi",
-        lambda _context: recorder,
+        lambda _context, **_kwargs: recorder,
     )
     service = WfMcpService(
         store=FileStore(tmp_path / "tool_invocation_store"),
@@ -167,7 +167,7 @@ async def test_registered_workflow_output_bindings_tool_preserves_union_order(
     recorder = RecordingWorkflowHandler()
     monkeypatch.setattr(
         "wf_mcp.workflow_surface.tools.WorkflowApi",
-        lambda _context: recorder,
+        lambda _context, **_kwargs: recorder,
     )
     service = WfMcpService(
         store=FileStore(tmp_path / "workflow_output_tool_store"),
@@ -242,7 +242,7 @@ async def test_registered_capability_tools_delegate_presence_aware_requests(
     recorder = RecordingWorkflowHandler()
     monkeypatch.setattr(
         "wf_mcp.workflow_surface.tools.WorkflowApi",
-        lambda _context: recorder,
+        lambda _context, **_kwargs: recorder,
     )
     service = WfMcpService(
         store=FileStore(tmp_path / "capability_tool_store"),

tests/wf_mcp/test_mcp_workflow_server.py

@@ -69,6 +69,8 @@ def test_workflow_server_from_service_wires_neutral_surfaces(tmp_path) -> None:
     assert isinstance(server, WorkflowServer)
     assert server.config.store_root == config.store_root
     assert server.api.context is server.context
+    assert server.api.drafts_enabled is True
+    assert server.api.drafts is not None
     assert server.source_registry_admin is not None
     assert server.admin.connections is service.connection_service
     assert server.admin.events is service.events