Add orb-v3-direct-inf-omat model#739
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Summary
ORB-v3 in its direct (non-conservative) configuration, predicting forces directly rather than as the gradient of an energy. Added as a non-conservative control for the physicality benchmarks.
Model Reference
orb-models: https://github.com/orbital-materials/orb-models
Checkpoint: orb-v3-direct-inf-omat (https://orbitalmaterials-public-models.s3.us-west-1.amazonaws.com/forcefields/orb-v3/orb-v3-direct-inf-omat-20250404.ckpt)
Linked issue
Resolves #738
Progress
Testing
Loads and runs a force evaluation via ml_peg. Non-conservative behaviour confirmed with the Jacobian Symmetry benchmark (PR #713): lambda ~0.006 vs ~1e-6 for the conservative orb-v3-consv-inf-omat.