Configuration and data files - How src/config.rs loads config.toml, the system prompt from SOUL.md and the optional image description request from VISION.md, how src/config_watch.rs reloads them live every 2 seconds, the supported keys and defaults (reply_delay_seconds, catch_up_seconds, ai_retries, web_port, transcribe_key/url/model/language), the template files, where the data directory and databases live, the build version and release profile, and operational and security caveats.
