started manual refactor

src/personal_mcp/registry/models/common.py

@@ -0,0 +1,29 @@
+import re
+from pathlib import PurePosixPath
+
+from pydantic import BaseModel
+from pydantic import ConfigDict
+from pydantic import field_validator
+
+SKILL_ID_RE = re.compile(r"^[a-z][a-z0-9-]*$")
+SEMVER_RE = re.compile(r"^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:[-+][0-9A-Za-z.-]+)?$")
+
+
+class ReferenceEntry(BaseModel):
+    model_config = ConfigDict(extra="ignore", str_strip_whitespace=True)
+
+    path: str
+    mime_type: str = "text/markdown"
+    title: str | None = None
+
+    @field_validator("path")
+    @classmethod
+    def validate_reference_path(cls, value: str) -> str:
+        path = PurePosixPath(value)
+        if path.is_absolute() or ".." in path.parts:
+            raise ValueError("reference path must be a relative in-skill path")
+        if not str(path).startswith("references/"):
+            raise ValueError("reference path must stay under references/")
+        if path.suffix.lower() != ".md":
+            raise ValueError("reference path must target a markdown file")
+        return path.as_posix()