XBG7_MONOTONE=1 enforces descriptor order per (stride, vtx, idx) signature: 89
minority decodes, unchanged. Monotonicity constrains order WITHIN a container
while the disagreement is BETWEEN containers, which hold different numbers of
these boxes in different arrangements. The remaining 89 are bounding-box identity
ambiguities needing descriptor-level information, not another anchoring
heuristic. Knob kept, default off, measurement recorded; suites green.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>