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Finding 58 AMENDS finding 41, which was Phase 10's headline result and drove every dispatch decision. The "1-in-12 for 200-800 B" comparison was taken on a queue that had never been attempted (5 of 427 rows above 244 B ever tried, 1.2%; three in an excluded class; both non-excluded attempts near-matched). The first row attempted above the ceiling matched. The band's measured yield is a function of the lever set at the time of measurement, and the lever set grows -- RE-MEASURE a band before concluding it is exhausted, and never treat a band as closed at ~1% attempt coverage. Findings 59-62: the local-aggregate row-stride/element-size lever that broke the ceiling (int t[3][4] not int t[9]; frame 48 vs 40; residual concentrated on the frame adjustment); the division_check trapped class; the localisation of the maspsx/GNU-as mutual exclusion with the developer's ASPSX-as-oracle-only rule; and the fail-fast validation of region override keys in sf3_merge.