Records the verified root cause + the dismissed-with-evidence findings:
- _sessionFileKeys "separator mismatch" = FALSE POSITIVE (real U+0001 chars, verifier Read rendered them invisibly)
- queueJobs O(N) per-render scan = real but Blink-measured <0.1ms at 3000 jobs -> skipped
- standing 2000-row relayout = median 0.4ms -> no virtualization needed
- doodstream sync _debugLog = constant freeze, deferred to a separate change
Lesson: measure magnitudes at the real artifact before fixing a "scales-with-X" cause;
profile in real Blink (Playwright) not jsdom; verify multi-agent findings against primary
evidence (char-code dump caught the control-char false positive).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>