Single-file diff

POST /api/v1/projects/{project_ref}/update/diff

local_sha256 appears only here, never on check. Lookup-only: does not enqueue pack. Unknown magic: client falls back to full package. Admin generation is a Job. Cache-Control: private, no-store, no ETag.

Schema: API reference (openapi.client.json; open Scalar). Concepts: Incremental updates.