US04-03: Apply and Verify Guarded Renames (#68)

photo_pipeline/schemas/renames.py

@@ -0,0 +1,11 @@
+"""Rename apply/confirmation request contracts."""
+
+from __future__ import annotations
+
+from pydantic import BaseModel
+
+
+class ApplyPlanRequest(BaseModel):
+    # The server-issued plan version the user confirmed; a mismatch is a 409.
+    expected_version: int
+    expected_checksum: str | None = None