Add perf regression test harnesses #1669

Bugbot Review

Bugbot Analysis Progress (4m 33s elapsed)

✅ Gathered PR context (3s)
✅ Completed bug detection (4m 23s)
✅ Posted analysis results (8s)

Final Result: Bugbot completed review and found 1 potential issue. 4 previously reported issues remain unresolved.

Request ID: serverGenReqId_50ec603a-aaae-4d9b-a0e0-7ae41ef3680a

Cursor Bugbot has reviewed your changes and found 1 potential issue.

There are 5 total unresolved issues (including 4 from previous reviews).

^{Bugbot Autofix is ON. A cloud agent has been kicked off to fix the reported issue.}

^{Reviewed by Cursor Bugbot for commit e9fa2b7. Configure here.}