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dyn4: the golden for libcvc's dyn4_si_of on the Jolt-fitted tires - #135

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feat/dyn4-golden-753
Oct 21, 2026
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transfix merged 1 commit into
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feat/dyn4-golden-753

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This is the golden for transfix/libcvc#731 at 8ef864171, which aligns libcvc's dyn4_si_of with #753's Jolt-fitted dyn_bike_si_of:

  • the tires' B·C = 1.12 / α_peak;
  • front and rear stiffness alike (front_stiffness 1);
  • the drive lag by drivetrain (drive_lag -1).

libcvc's Dyn4.Golden was regenerated with it, and this PR copies tests/fixtures/dyn4_golden.json from there (byte-identical).

The torch twin reads the vehicle from the file (Dyn4Params(**data["params"][...])), so no code changes. tests/test_dyn4_parity.py and tests/test_dyn_bike_parity.py pass locally: 23 passed.

Merge together with transfix/libcvc#731.

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transfix merged commit 84c5dd0 into main Oct 21, 2026
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