- PATCH accepts name and signatureFields for rename and field save per D-10 - PATCH sets updatedAt: new Date() explicitly per D-05 - PATCH returns 404 for archived or missing templates - DELETE soft-deletes by setting archivedAt: new Date() per D-07 (no hard delete) - DELETE sets updatedAt: new Date() per D-05, returns 204 No Content - Both handlers auth-gated with auth() per D-11