docs: I5 observer-invisibility evidence (rasterizer-controlled A/B) - #32
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…n controlled LP_NUM_THREADS=2 rerun isolates the llvmpipe confound: p99 identical (65.9us noop vs 65.7us attached), p99.9 +12% — no tail coupling through the ingestion boundary; the original p99.9 blow-up was core competition, as diagnosed. Residual p50 shift is powersave wake-up noise (<1% of the 1kHz period). Hardware-GL run remains the final pin, downgraded from open question to confirmation.
imgui.ini and root-level report JSONs are per-run working files; the canonical pinned result lives in tests/benchmarks/ingestion/results/.
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Follow-up to #31: reruns the observer A/B with llvmpipe capped to 2 threads, isolating the diagnosed confound. Result: p99 identical (65.9 µs no-op vs 65.7 µs attached), p99.9 +12% — no tail coupling through the ingestion boundary. Conformance table updated; result JSON pinned. Hardware-GL run (needs a display session:
./scripts/bench_ingestion.sh --filter=observer) is now confirmation, not an open question. Docs + result artifact only.