_fluid_force: zero force for body with negligible mass
#985
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kbayes
approved these changes
Jan 6, 2026
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apply zero force to a body that has (very) small mass. this prevents division with a (very) small number than can lead to nans.
mujoco reference https://github.com/google-deepmind/mujoco/blob/fa044fe0e53d728a0a242bcb5d2a5c7c2c4f4551/src/engine/engine_passive.c#L517
resolves #930