notebooklm-mcp-cli-auth-format-two-files

Upstream notebooklm-mcp-cli uses TWO auth files, not one: profiles/default/cookies.json (cookies) and profiles/default/metadata.json (session metadata). Our custom wrapper used a single storage_state.json in notebooklm-py format. CSRF token and session_id are auto-extracted by upstream on first API call — only cookies are required for migration.