From d19bec3c750a9d615bf944d8e7e75df03aeddcb2 Mon Sep 17 00:00:00 2001
From: Ronald Tse <ronald.tse@gmail.com>
Date: Tue, 1 Sep 2026 10:53:13 +0200
Subject: [PATCH] =?UTF-8?q?docs(EXPERIMENTS):=20head32=20flip-rate=20CIs?=
 =?UTF-8?q?=20=E2=80=94=20heb=20repair=20overwhelming,=20khm=20a=20proper?=
 =?UTF-8?q?=20null?=
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Paired bootstrap over per-pair position dumps (the new parity
feature): heb-diac 10.985% -> 0.288% flips, delta -10.696pp, 95% CI
[-11.661, -9.726]. khm-latn 2.325% -> 2.302%, CI [-0.173, +0.125] —
statistically indistinct, exactly right for a family that was never
broken. Probe-set note disclosed (full gate sets vs the original E1
golden subset).
---
 docs/EXPERIMENTS.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/docs/EXPERIMENTS.md b/docs/EXPERIMENTS.md
index b0096ea..c55949c 100644
--- a/docs/EXPERIMENTS.md
+++ b/docs/EXPERIMENTS.md
@@ -95,6 +95,16 @@ All rows passed the CER parity gate at release. Readings:
   profile; needed an fp32 export first (the volume had none — also
   fixed the plain-export entrypoint double-split en route, PR #109).
   All five head32 artifacts are gated and sitting on the volume.
+- **Flip-rate CIs (2026-09-01, per-pair position dumps + paired
+  bootstrap, 10k resamples)**: heb-diac — the outlier family —
+  shipped 10.985% -> head32 0.288% flips, delta **-10.696pp, 95% CI
+  [-11.661, -9.726]**: the repair is overwhelming. khm-latn — a
+  benign family — 2.325% -> 2.302%, CI [-0.173, +0.125]: a proper
+  null, i.e. the rebuild changes nothing measurable where nothing
+  was broken (head32's role there is consistency, not repair).
+  Probe-set note: these use the full gate sets (1,864 / 895 pairs),
+  not the original E1 golden subset — the shipped-heb side therefore
+  reads 10.985% vs the table's 9.34%; same story, larger set.
   **Swap-in is a version decision**: (a) replace the shipped int8
   zips in place + cut index-v2 (consumers re-download; sha pins
   change deliberately), or (b) publish as parallel `-int8-head32`