Flat manifest of source files (path, size, last_modified)

GET /contexts/{slug}/source/manifest

• slug (path, string, required) — Context slug or UUID.
• X-Pinecone-Api-Version (header, string) — Date-based contract version, echoed back on the same header. Omit for the default (2026-07); send unstable for the in-development surface. An unrecognized value is rejected with 400 unsupported_api_version.

• 200 — Source manifest
• 404 — Not found