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PERF3: pumpBench.test.ts pins pump()'s pipeline cost — 0.43ms @5k items, 1.47ms @20k (median) — negligible at a few events/sec, so the count+pointer rewrite of the core queue is declined as risk without reward; the benchmark stays as a 5ms regression tripwire. PERF6/L162: closed as documented-by-design (virtualization bounds mounted thumbs; a theme prop conflicts with PERF5's stable renderer). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>