SynthStrip model weights (models/synthstrip.1.rvss)

Source:  https://surfer.nmr.mgh.harvard.edu/docs/synthstrip/requirements/synthstrip.1.pt
         (SHA-256 37417f802196186441aae3e7f385d94f8a98c64a88acaeaa2723af995c653e33)
Authors: A. Hoopes, J. S. Mora, A. V. Dalca, B. Fischl, M. Hoffmann
Paper:   SynthStrip: Skull-Stripping for Any Brain Image. NeuroImage 260 (2022)
         119474. https://doi.org/10.1016/j.neuroimage.2022.119474

The SynthStrip documentation states: "You can choose to access the weight
files under either the MIT license or the CC BY 4.0 license". RadVeil uses
them under the MIT license, reproduced below. The documentation names no
copyright holder; the copyright line below names the paper's authors (the
rights may be held by their institutions).

Modification: converted by tools/export_synthstrip.py from the PyTorch
checkpoint to RadVeil's .rvss layout, with weights rounded to float16
(biases float32). The network is re-implemented in src/synthstrip.rs.
Outputs match the PyTorch model to < 2e-3 mm on the test input.

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B. Fischl, M. Hoffmann)

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