Two correctness/integrity fixes on the cross-viewpoint fusion geometry path,
each pinned by a regression test that fails on the old code.
- GDOP mislabel (§2.3): CramerRaoBound.gdop was `sqrt(crb_x+crb_y)` — identical
to rmse_lower_bound (metres, noise-dependent), NOT a dimensionless GDOP. Now
computes true GDOP = sqrt(trace(G^-1)) on the unit-variance bearing geometry,
in both estimate() and estimate_regularised(); INFINITY (not NaN) for
degenerate collinear geometry. Test gdop_is_dimensionless_and_noise_independent
asserts GDOP is unchanged under 10x noise while RMSE scales 10x (old code
failed: it scaled with noise, proving it was RMSE).
- Angular wrap (§2.1): GeometricBias::build_matrix used raw |delta-azimuth|
(can exceed pi, mis-states the 0/2pi seam) instead of the wrapped distance.
angular_distance made pub and reused as the single canonical helper. HONEST:
under the current cos() kernel this is a NUMERIC NO-OP (cos is even/periodic,
cos(raw)==cos(wrapped)); landed for contract correctness + single-source-of-
truth + future non-even kernels, not as a behaviour change. Tests pin the
contract (wrapped value in [0,pi], seam symmetry).
ruvector lib tests: 100 passed / 0 failed (+ new tests).
Co-Authored-By: claude-flow <ruv@ruv.net>
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