~/.duckbrain/<instance>/ (default instance: default): the DuckLake catalog (SQLite, WAL), the lake/ Parquet directory, the bronze envelope tables, and a per-instance state.sql agent surface.
Then shows an interactive platform multi-select (arrow keys, space to toggle). Selecting a platform installs its crawler from openclaw/tap via Homebrew, runs the crawler’s own init, and prints next steps.
Non-interactive: --sources slack,imessage skips the picker; --sources none opts out. The prompt auto-skips when stdin isn’t a TTY, so scripts and buttons stay non-interactive.