prompt without seed_config, the server regenerates the seed config.
Pass generation_mode as "fast" (default) or "thorough" when regenerating. Fast prioritizes speed; Thorough handles complex requirements with a longer wait. Omit seed_config to generate new data:
generation_mode alone does not regenerate data. Explicit seed_config takes precedence over generation. The mode defaults to Fast on each request; it is not a saved scenario preference.
