- Fix CRITICAL: Increase single-spawn threshold from 10ms to 50ms (CI flakiness) - Fix CRITICAL: Replace no-op validation test with real backoff scale tests - Fix IMPORTANT: Add warmup iterations before all timed measurements - Fix IMPORTANT: Increase scan position ratio tolerance to 10x for sub-ms noise - Refactored queue perf tests to use actual service methods (calculateBackoffDelay) - Helper function to reduce spawn request duplication Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>