fix: address coderabbit followups

tests/wf_mcp/test_mcp_workflow_server.py

@@ -35,7 +35,8 @@ def _registry_entry(source_id: str) -> McpSourceRegistryEntry:
 
 def test_wf_server_package_stays_mcp_free() -> None:
     path = "src/wf_server/context.py"
-    tree = ast.parse(open(path, encoding="utf-8").read(), filename=path)
+    with open(path, encoding="utf-8") as file:
+        tree = ast.parse(file.read(), filename=path)
 
     violations: list[str] = []
     for node in ast.walk(tree):

tests/wf_mcp/test_workflow_config_bridge.py

@@ -1,10 +1,14 @@
 from __future__ import annotations
 
+from pathlib import Path
+
 from wf_config import WorkflowConfigFile
 from wf_mcp.broker.config import broker_config_from_workflow_config
 
 
-def test_broker_config_from_workflow_config_converts_mcp_sources(tmp_path) -> None:
+def test_broker_config_from_workflow_config_converts_mcp_sources(
+    tmp_path: Path,
+) -> None:
     workflow_config = WorkflowConfigFile.model_validate(
         {
             "version": 1,
@@ -52,7 +56,9 @@ def test_broker_config_from_workflow_config_converts_mcp_sources(tmp_path) -> No
     assert connection.metadata["description"] == "Everything test server"
 
 
-def test_broker_config_from_workflow_config_converts_mcp_http_source(tmp_path) -> None:
+def test_broker_config_from_workflow_config_converts_mcp_http_source(
+    tmp_path: Path,
+) -> None:
     workflow_config = WorkflowConfigFile.model_validate(
         {
             "version": 1,
@@ -83,7 +89,9 @@ def test_broker_config_from_workflow_config_converts_mcp_http_source(tmp_path) -
     assert connection.metadata["headers"] == {"X-Test": "yes"}
 
 
-def test_broker_config_from_workflow_config_ignores_non_mcp_sources(tmp_path) -> None:
+def test_broker_config_from_workflow_config_ignores_non_mcp_sources(
+    tmp_path: Path,
+) -> None:
     workflow_config = WorkflowConfigFile.model_validate(
         {
             "version": 1,