docs(track): result_migration_small_files decisions for src/performance_monitor.py (1 compliant; 0 migration)
The post-Phase-1 audit reports src/performance_monitor.py has 0 violations, 0 suspicious, 0 unclear, and 1 compliant site. Per-site decision: the 1 site is compliant (likely a try/finally or BOUNDARY_IO pattern); no migration needed.
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