Per Andrey: characterize the per-scene measurement, incl. the eigenvector data.
-POSE-RT-HYPER (80x64, z=scenes, t=components, make_hyper layout): dx, dy,
strength, dxy=|dx,dy| from vector_XYS; sqrt_l0, sqrt_l1 (peak-ellipse half-axes,
pix), elong=sqrt(l1/l0) (linear-feature indicator), eig0_ang (precise-axis
direction, [0,PI)) from coord_motion eigen {eig_x,eig_y,l0,l1} - NaN unless
imp.eig_use. Data = last LMA cycle's coord_motion via the existing
coord_motion_rslt out-param. -POSE-RT-RELIABLE = tile selection mask.

Verified with standalone javac against target/classes (Eyesis live - no mvn;
Eclipse rebuilds on restart).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>