started model tests

src/personal_mcp/registry/models/common.py

@@ -47,3 +47,12 @@ class ReferenceEntry(StrictFrozenModel):
         if path.suffix.lower() != ".md":
             raise ValueError("reference path must target a markdown file")
         return path.as_posix()
+
+
+def _normalize_docs_path(path: str) -> str:
+    normalized = PurePosixPath(path)
+    if normalized.is_absolute() or ".." in normalized.parts:
+        raise ValueError("path must be a normalized docs-relative path")
+    if normalized.suffix.lower() != ".md":
+        raise ValueError("path must point to a markdown file")
+    return normalized.as_posix()