Project 3087 post-discovery channel/height sensitivity: PASS
Rows retained from upstream XYZ: 25809
MAGCOM/MAGNIV/MAGMIC: 14/14 target-negative and 14/14 north-positive at all four 250-m bin phases (OLS).
MAGBRU/MAGCOR: 13/14 at one 125-m shifted target phase, 14/14 at the other three; north remains 14/14 positive.
Target height/topography positive-slope counts across every phase: GPSALT 13/14; BARO 13/14; ALTURA 4/14; MDT 10/14.
Raw-point OLS: MAGBRU/MAGCOM/MAGCOR/MAGNIV/MAGMIC all 14/14 target-negative and 14/14 north-positive.
Interpretation: supports multi-channel turnover and rejects a simple universal sign mimic by the supplied height/topography channels; it is not an altitude-corrected replacement for the frozen primary operator.