{
 "date": "2026-10-21",
 "purpose": "Contribution of each shipped change on the clean build: each arm switches one change off with its control environment variable (first arm = full role path)",
 "scope": "4 x H100, 2A2F, E128 top-k 8, capacity 2048, random, BF16, graphs, 24 SMs; three fresh-process repeats",
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