Repeat-pair runs measured 2-4% between-run drift on one machine, enough to
flip threshold verdicts near the margin on every rerun.
- bench keeps its iteration samples: rows carry a median sigma, and per-shape
sentinel re-measurements sample run-level clock drift
- on/off verdicts are three-zone at the run's own noise level; too close to
the margin keeps the current setting and says so
- pv candidates (now including fp16) are tested independently against the
margin at a sidak-adjusted z instead of min-then-threshold
- unmeasured toggle stacks are estimated additively in the composition check
- per-shape qk verdicts print alongside the reference-shape verdict
- cross-gpu error sanity bands flag corrupted measurements
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