move / dedup some wf_mcp things

src/wf_api/refs.py

@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+from typing import Any, TypeAlias
+
+from wf_artifacts import WorkflowCapabilityRef
+from wf_platform import CapabilityRef
+
+WorkflowSurfaceCapabilityId: TypeAlias = CapabilityRef | WorkflowCapabilityRef
+
+
+def parse_workflow_surface_capability_id(
+    value: str | dict[str, Any],
+) -> WorkflowSurfaceCapabilityId:
+    """Parse a workflow API capability id into its real domain ref.
+
+    API callers still pass strings at protocol boundaries. Internally,
+    workflow-facing capability ids are either live source capabilities or saved
+    wrapper artifacts, so this parser avoids inventing a third identifier model.
+    """
+    if isinstance(value, dict):
+        if "artifact_id" in value and "version" in value:
+            return WorkflowCapabilityRef._validate(value)
+        return CapabilityRef._validate(value)
+
+    try:
+        return WorkflowCapabilityRef.parse(value)
+    except ValueError:
+        return CapabilityRef.parse(value)