notebooklm-upstream-auth-two-file-format

The notebooklm-mcp-cli upstream expects auth stored as two files under $NOTEBOOKLM_MCP_CLI_PATH/profiles/default/: cookies.json (raw cookie k/v map) and metadata.json. This differs from notebooklm-py’s single storage_state.json Playwright format. CSRF token and session_id are auto-extracted by the upstream on first API call — only cookies are required in the initial file.