aircraft & downwelling RT support, surface-reflectance derivation, and clear-sky bookkeeping fixes#276

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BenjaminTJohnson wants to merge 6 commits intodevelopfrom

feature/btj_TL_AD_K_Matrix_consistency

Commits on Dec 30, 2025

initial commit
BenjaminTJohnson
committed
Add obs_4_downward TL/AD consistency across RT solvers; wire obs_4_downward through emission and scattering TL/AD paths; implement downwelling TL/AD for ADA and SOI solvers; fix CloudScatter TL bac…
BenjaminTJohnson
committed
added Obs_4_downward_P tests to test_Simple TL/AD ctests
BenjaminTJohnson
committed

Commits on Jan 2, 2026