pub fn add_clearance_exposure_risk(
cells: &[Vec<TerrainRiskCell>],
config: &ClearanceRiskConfig,
) -> RoboticsResult<Vec<Vec<TerrainRiskCell>>>Expand description
Add low-clearance exposure risk while preserving existing terrain channels.
A cell at or above minimum_clearance receives no additional exposure risk.
Closer cells receive linearly increasing risk up to max_risk.