Technical notes:

ChatGPT projects are internally "gizmos" — the correct API is /backend-api/gizmos/{g-p-hex32}/conversations?cursor=0, not the undocumented /projects endpoint (which 404s) Cursor-based pagination throughout (offset-based parameters are silently ignored by the API) MutationObserver captures project links from the sidebar DOM, including the hover-only "More" popup Pure JS ZIP builder: CRC32 + local headers + central directory + EOCD, no libraries Chrome MV3, long-lived port for popup ↔ content script communication; export survives popup close Markdown content is pre-encoded to Uint8Array before ZIP assembly to halve peak memory usage