model weights

fix: degraded test + e2e FAIL label

- Model download failure is now a hard error (exit 1), not soft warning
- Fixed broken _query() call in run_e2e.py causing TypeError at exit
- Added Dockerfile.pypi test variant

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Session-Id: 80f30d89-8f55-47d5-9fc2-2c47e009c4c7
Session-Msg: 1081