Confirm suspected integrated benchmark regressions once with target order
reversed. Same-run measurements can still be biased by sustained runner drift:
a control run on identical Rust sources produced a 29% apparent pnpr slowdown.
Keep the 5% tolerance with a 2 ms floor and the retained-sample noise guard.
Require the regression to reproduce in the confirmation, preserve both sets
of measurements in the artifact and report, and keep the initial timings for
historical Bencher uploads. Missing required confirmations fail the check.
The wrapper preserves the existing harness arguments and assertions. It does
not retry command failures, and confirmation failures propagate. Main-only
runs and scenarios without suspected regressions execute once.
Related to pnpm/pnpm#15228.
Zoltan Kochan
3450bb8fa7