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The ModelSettings.model_name dataclass default was still vitmatte-small (the phase-1 "start small" choice) while configs/default.yaml used vitmatte-base, so a bare run (no --config) silently differed from every documented example. Set the dataclass default to base too: the built-in defaults now match default.yaml field-for-field, so --config is only needed after editing that file to tune parameters. README examples drop the now-redundant --config. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>