notebooklm-mcp-cli-auth-two-file-format

Upstream notebooklm-mcp-cli uses two-file auth under profiles/default/: cookies.json (AuthTokens format with cookie key-values) and metadata.json. This differs from notebooklm-py’s single storage_state.json format. CSRF token and session ID are auto-extracted by upstream on first API call — only cookies are needed for initial migration. Any cookie-refresh cron must be updated to write this new format.