Added: 451 (block inside / crossing a hollow spherical-shell tool), 1107 (hollow hub joined
with nine blades), 1140 (spiral hollow lofted tube cut in half and joined), 2928 (cap-touching
lips with 0.0001 mm offset walls), 3850 with 3741 (cross cut touching a round side, and the
hole after it), 1984 (near-coaxial pin and rivet overlaps). #3573 is now a source of
shell/3576. Their lines are gone from the skipped files; #2259, #3518 and #3602 stay skipped
with corrected reasons.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>