refactor: move mcp catalog dtos to wf_sources_mcp

tests/wf_sources_mcp/test_import_direction_guard.py

@@ -4,8 +4,9 @@ import ast
 from pathlib import Path
 
 # Temporary low-level wf_mcp imports are allowed for connection id parsing,
-# reserved names, and broker DTO conversion. Frontend/proxy/workflow-surface
-# imports are forbidden because wf_sources_mcp is upstream-source code.
+# reserved names, and broker DTO conversion. Catalog DTOs should now be local
+# to wf_sources_mcp. Frontend/proxy/workflow-surface imports are forbidden
+# because wf_sources_mcp is upstream-source code.
 FORBIDDEN_WF_MCP_PREFIXES = (
     "wf_mcp.admin_surface",
     "wf_mcp.workflow_surface",
@@ -40,3 +41,34 @@ def test_wf_sources_mcp_does_not_import_frontend_mcp_modules() -> None:
         "wf_sources_mcp imports frontend/proxy MCP modules:\n"
         + "\n".join(f"  {violation}" for violation in violations)
     )
+
+
+def test_wf_sources_mcp_does_not_import_wf_mcp_catalog_dtos() -> None:
+    root = Path(__file__).resolve().parents[2] / "src" / "wf_sources_mcp"
+    forbidden = {
+        "wf_mcp.capabilities",
+        "wf_mcp.catalog",
+        "wf_mcp.catalog.models",
+    }
+    violations: list[str] = []
+
+    for py_file in sorted(root.rglob("*.py")):
+        rel = py_file.relative_to(root.parent)
+        module = str(rel.with_suffix("")).replace("/", ".").replace("\\", ".")
+        tree = ast.parse(py_file.read_text(encoding="utf-8"), filename=str(py_file))
+        for node in ast.walk(tree):
+            if isinstance(node, ast.ImportFrom) and node.module in forbidden:
+                violations.append(
+                    f"{module}:{node.lineno}: from {node.module} import ..."
+                )
+            elif isinstance(node, ast.Import):
+                for alias in node.names:
+                    if alias.name in forbidden:
+                        violations.append(
+                            f"{module}:{node.lineno}: import {alias.name}"
+                        )
+
+    assert violations == [], (
+        "wf_sources_mcp still imports old wf_mcp catalog DTO modules:\n"
+        + "\n".join(f"  {violation}" for violation in violations)
+    )