debug_grouped_report (why_rejected) shows n206_02's alternative pool is ACCEPTED at pad 0 under production gates and is in the candidate list -- and the decoder does take it: n206_02 now anchors at 0x342d984. The 'still collapsed' reading came from the audit comparing decoded geometry, and that offset holds a direct (unmirrored) copy, so a separated pair still looked identical. The audit now requires a SHARED BUFFER to call it a collapse: disc-wide 18 exact mirrors, 16 related, 0 collapses, 0 unrelated -- and the regression test drops its exception. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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