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982994ca3c
estimate_gdop returned an average-pair-angle factor merely labelled GDOP (the same class of defect ADR-156 §2.3 fixed). Replaced with the genuine Geometric Dilution of Precision computed from the range-measurement Jacobian H (unit target->sensor bearings): GDOP = sqrt(trace((HtH)^-1)), dimensionless, returning None for singular (collinear) geometry which the caller treats as factor 1.0. Tests assert a well-spread array yields lower GDOP than a near-collinear one, cross-check the closed form, and confirm singular geometry returns None. Co-Authored-By: claude-flow <ruv@ruv.net>