- PathCompute: compute_loss_budget/5 and compute_power_budget/2 made
public with @doc false; property tests covering fspl, o2, h2o, rain,
diffraction across all 13 known bands + varying distances
- Viewshed: property tests for destination_point back-bearing round-trip
and east-west bearing at equator (2 new properties)
Coverage: 79.07% → 79.06% (PathCompute 60→63%)