Graham McIntire b161ed4b3f feat(prop-grid-rs): port Propagation.Duct to Rust ... Pure port of lib/microwaveprop/propagation/duct.ex — the ITU-R P.834 duct detector that computes the modified refractivity M-profile and finds regions where dM/dh < 0, then uses Bean & Dutton to derive the minimum trapped frequency per duct. Part of Stream A (f00 port): compute_duct_metrics and the per-cell native-level duct merge both build on analyze(). Landing it now with standalone unit tests lets later tasks (fetch_native_duct_grid, the wgrib2 subprocess for native levels) treat it as a known-good dependency instead of a concurrent port.		2026-04-19 17:44:37 -05:00
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prop_grid_rs	feat(prop-grid-rs): port Propagation.Duct to Rust	2026-04-19 17:44:37 -05:00