* chore: add per-job perf profiler and its docs
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* chore: create perf output dir and refuse to sample with backtraces enabled
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* chore: treat PERF_SQL=0 as off and tag reports with their mode
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>