Per Andrey: a selected tile is BAD if its measured dxy is NaN in any scene or
exceeds curt_pose_max_dxy (absolute, default 0.25 pix) in at least one scene.
Survivors saved as -POSE-RT-RELIABLE-FILT.tiff; curt_pose_use_filt loads it on
a next run and ANDs with the strength selection (two-pass workflow: full run
calibrates the selection, subsequent runs use ~191 clean tiles instead of 1074
on the reference footage; kept-tile mean dxy 0.087 pix).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>