Relative 'in/weights' path fails when script is run from outside the
project root. Use _PROJECT_ROOT / "in" / "weights" instead.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
SegConfig(prompts=None) crashes on len(None) when gin config is not
loaded. Pass the 11-class prompt list directly.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>