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diff --git a/artifacts/rewrite-efficacy-study4/bridge-en-verdict-gemini-3.7-flash.json b/artifacts/rewrite-efficacy-study4/bridge-en-verdict-gemini-3.7-flash.json
new file mode 100644
index 00000000..f49b8ca5
--- /dev/null
+++ b/artifacts/rewrite-efficacy-study4/bridge-en-verdict-gemini-3.7-flash.json
@@ -0,0 +1,28 @@
+{
+  "computed_at": "2026-09-03T23:28:49.538Z",
+  "stage": "en",
+  "s1_arm": "A1",
+  "rule": {
+    "min_auc": 0.85,
+    "spearman_slack": 0.1,
+    "reference": "grok-vs-gpt on the same passages"
+  },
+  "passages_scored": 84,
+  "originals": 42,
+  "n_ai": 21,
+  "n_human": 21,
+  "auc_gemini": 0.9943310657596371,
+  "auc_gpt_reference": 1,
+  "auc_grok_reference": 0.9977324263038548,
+  "n_paired": 84,
+  "spearman_gemini_gpt": 0.9109976002674424,
+  "spearman_grok_gpt": 0.8943306674236398,
+  "spearman_gemini_grok": 0.8805498403188557,
+  "candidate": "judge-gemini-3.7-flash",
+  "admitted": true,
+  "judges": [
+    "judge-gpt",
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diff --git a/docs/research/2026-rewrite-efficacy-prereg.md b/docs/research/2026-rewrite-efficacy-prereg.md
index b6ba1c86..87cb90a9 100644
--- a/docs/research/2026-rewrite-efficacy-prereg.md
+++ b/docs/research/2026-rewrite-efficacy-prereg.md
@@ -684,6 +684,22 @@ Bridge results on the 108 archived S1-D passages (reference on the same passages
 
 Selection rule (highest AUC among admitted) picks **`judge-gemini-3.7-flash`**. From this note on, stage 1 is a two-judge panel (`judge-gpt` + `judge-gemini-3.7-flash`) plus det: the admitted judge scores every stored P/S body from rows finished so far, and the runner is restarted with both judges for the remaining rows. The results doc drops the *single-perceptual-judge* label and reports every candidate above. The deepseek bridge may be resumed for the record only; it cannot change the selection.
 
+### Study 4 — dated note 2026-09-04 (before any stage 2 row): stage 2 (en) started on the owner's instruction
+
+Stage 1 (ko) closed on 2026-09-03 with H-4b not supported. The owner asked to resume; stage 2 runs under the identical registered rules. Before the first row: (1) the 42 Arm-A1 documents inherit Study 1's `spok` exclusion (pilot Deviation 4); (2) the second-judge seat is re-bridged on the 84 archived Arm-A1 passages (42 originals + 42 S1 rewrites) with the English judge prompt under the same admission rule — `judge-gemini-3.7-flash` was admitted on Korean only. The bridge verdict is recorded in `artifacts/rewrite-efficacy-study4/bridge-en-verdict-gemini-3.7-flash.json`; if it fails, `judge-gemini-3.1-pro` is bridged next, and if neither passes stage 2 runs single-perceptual-judge as registered. Plumbing is smoke-tested on a synthetic English paragraph only.
+
+### Study 4 — dated note 2026-09-04 (before any stage 2 row): stage 2 judge seat
+
+EN bridge on the 84 archived Arm-A1 passages: `judge-gemini-3.7-flash` (Gemini API, the local research key — not the product keys, which the owner rotated to product-only use the same day) scored 84/84, **AUC 0.994**, Spearman vs gpt **0.911** (reference: gpt AUC 1.000, grok AUC 0.998, Spearman(grok, gpt) 0.894) — admitted. A subscription-only transport of the same model (`judge-gemini-3.7-flash-cli`, gemini CLI) was bridged in parallel to avoid API-key use; it produced 8/84 scores and then timed out three times in a row on consecutive passages (180 s each), so it is **not admitted** and its partial rows are discarded. Stage 2 therefore runs with the same two-judge panel as stage 1: `judge-gpt` + `judge-gemini-3.7-flash` (API) plus the det chief.
+
+### Study 4 — correction 2026-09-04: the "CLI" gemini transport was also API-key authenticated
+
+On this machine the gemini CLI's effective auth is `gemini-api-key` (`~/.gemini/settings.json` → `security.auth.selectedType`) and `GEMINI_API_KEY` is exported in the login shell, so every gemini CLI call in this study — the 2026-09-02 gemini-2.5-pro bridge (108 passages) and the 2026-09-04 `judge-gemini-3.7-flash-cli` bridge (8 passages before timeouts) — was billed to the local research key, not to a subscription. The earlier notes' "subscription-only" wording for that transport is withdrawn; the transports differ only in sampling defaults. Nothing about the admitted judge, the panel, or any row changes.
+
+### Study 4 — dated note 2026-09-04 (after stage 2): stage 2 closed; detail-token definition flaw on English
+
+Stage 2 (en, 42/42) closed **not supported** (paired d +3.7 [−3.5, +10.8]; det +12.1 [+4.5, +20.6]; floor met 42/42; meaning gate 38/42 violated). Post-hoc observation, not a criterion change: the registered detail-token regex `[A-Za-z][A-Za-z0-9+._-]+` matches every English word, so H-4b-c retention and guard rail 3 are vocabulary-overlap measures on English and are reported as such in the results doc. Both stages are complete; nothing ships; the next candidate is H-4a.
+
 ## Sources
 - Self-Preference Bias in LLM-as-a-Judge — arXiv:2410.21819
 - TH-Bench (humanizing attacks vs detectors) — arXiv:2503.08708
diff --git a/docs/research/2026-rewrite-efficacy-study4.md b/docs/research/2026-rewrite-efficacy-study4.md
index ac84f176..bf076607 100644
--- a/docs/research/2026-rewrite-efficacy-study4.md
+++ b/docs/research/2026-rewrite-efficacy-study4.md
@@ -161,12 +161,61 @@ the production prompt. The next candidate on the registered list is **H-4a —
 deterministic merge/split with seam-only LLM infill** — the first mechanism
 that acts on the architecture the judges keep naming.
 
-## Stage 2 (en)
-
-Registered to run after stage 1 with identical rules. Not started as of
-2026-09-03: the runner spends the owner's Claude subscription window (the
-same quota interactive sessions use), and the Korean result is decisive. If
-the owner wants the English data point, the bridge must first be re-run on the
-84 archived Study 1 Arm-A1 passages (the gemini-3.7-flash seat was admitted on
-Korean only), then `S4_STAGE=en` runs the same harness. A deferral is
-recorded here as a dated note per the registration; it is not a withdrawal.
+## Stage 2 (en) — completed 2026-09-04: **NOT supported either**
+
+Run 2026-09-04 07:02 → 10:15 UTC on the owner's instruction, 2 supervisor
+passes, no session-limit hits. The 42 Study 1 Arm-A1 documents (21 AI + 21
+human; `spok` excluded per pilot Deviation 4), same rewriter, English
+production prompt (template `72428aea…`), English constraint block
+(`81e2e53c…`) and retry suffix (`b320025b…`). Panel: `judge-gpt` +
+`judge-gemini-3.7-flash` (re-admitted on the 84 archived English passages:
+AUC 0.994, Spearman vs gpt 0.911 against grok's 0.894; the gemini CLI
+transport of the same model timed out and was not admitted). Det chief
+fresh-corpus accuracy on the English originals was **0.762 < 0.85**, so per
+panel v2 the binary det column is disabled and only the continuous det score
+is reported.
+
+| | P (plain) | S (specificity) | paired d = S − P (95% CI) |
+|---|---:|---:|---|
+| AI docs, panel AI-likeness (n=21) | 81.8 | **85.5** | **+3.7 [−3.5, +10.8]** |
+| AI docs, det chief (continuous) | 11.3 | **23.4** | **+12.1 [+4.5, +20.6]** |
+| human docs, panel (n=21) | 10.5 | 9.5 | −0.9 [−3.3, +1.9] (guard rail 2 held) |
+
+- **H-4b-a: NOT SUPPORTED.** The point estimate is positive again and the
+  interval includes zero. AI-call rate 95.2% → 95.2% (discordant 2 vs 2).
+- **The floor executed this time.** Unlike Korean, every English S row met
+  the 98% floor (42/42; mean 1.67 attempts on AI docs). The plain rewrite
+  compresses English hard (P length ratio **0.806** on AI docs, 0.908 on
+  human); S restored it to 1.03 / 1.00. So stage 2 is the clean test of the
+  hypothesis that stage 1 could not deliver: with the length actually held,
+  the constrained rewrite still reads *more* AI-like to both the panel and
+  the deterministic scorer.
+- **Copy check:** S median trigram Jaccard 0.630 vs P 0.540 on AI docs; on
+  human docs 0.885 vs 0.746 (just under the 0.90 "rewrote less" line).
+- **Guard rail 1: 38/42 = 90.5% — VIOLATED** (no corpus-artifact documents
+  in this arm; four real dropped numbers in S; P 37/42). Rails 2 and 3 held.
+- **Cue mix on AI docs still called "ai":** structural share fell from 35%
+  (P) to 18% (S) while the specificity-absence class rose from 11 to 17 of 40
+  cues. English judges name different residual tells than Korean judges
+  (Korean: 84–92% structural), and keeping the length did not remove them.
+- **Descriptive gpt-only:** S1 rw1 74.0 | P 86.0 | S 89.5 on AI docs — the
+  same upward drift of today's plain rewrite versus July's that stage 1
+  showed (prompt changed twice since; judge drift possible).
+
+**Metric caveat found after the fact (not a criterion change):** the
+registered detail-token definition counts every Latin token of two or more
+letters, which in English is every word. The English "retention" (P 45% →
+S 64%) and "added tokens" (~130 per document in both arms) therefore measure
+vocabulary overlap, not concrete details, and guard rail 3 is vacuous for
+English. The numbers-and-quotes part of the definition is unaffected; a
+future English stage needs a detail definition that excludes ordinary
+words. Recorded here and in the prereg as a dated note.
+
+### Combined verdict
+
+Both stages fail the registered primary criterion in the same direction and
+both violate the meaning gate. In Korean the model would not hold the floor;
+in English it held the floor and the result got worse. The hypothesis that
+the plain rewrite's lost specificity is what judges react to is not
+supported in either language. Nothing ships; the next candidate remains
+H-4a.
diff --git a/scripts/research/rewrite-efficacy-study4-bridge.mjs b/scripts/research/rewrite-efficacy-study4-bridge.mjs
index b73a5956..f95e69ea 100644
--- a/scripts/research/rewrite-efficacy-study4-bridge.mjs
+++ b/scripts/research/rewrite-efficacy-study4-bridge.mjs
@@ -14,13 +14,21 @@ import {
 } from './study4-common.mjs';
 
 // BRIDGE_JUDGE selects the candidate (default: the original gemini CLI judge).
+// BRIDGE_STAGE=en bridges on the archived Study 1 Arm-A1 passages (spok
+// excluded per pilot Deviation 4) with the English judge prompt; files carry
+// an `en-` prefix. Default stage ko = Arm D.
 const JUDGE_ID = process.env.BRIDGE_JUDGE || 'judge-gemini';
 const JUDGE = JUDGE_DEFS[JUDGE_ID];
 if (!JUDGE) throw new Error(`unknown bridge judge ${JUDGE_ID}`);
+const STAGE = process.env.BRIDGE_STAGE === 'en' ? 'en' : 'ko';
+const S1_ARM = STAGE === 'en' ? 'A1' : 'D';
+const EXCLUDED_REGISTERS = new Set(['spok']);
 const SUFFIX = JUDGE_ID === 'judge-gemini' ? '' : `-${JUDGE_ID.replace(/^judge-/u, '')}`;
-const ROWS = join(OUT_DIR, `bridge-gemini${SUFFIX}.jsonl`.replace('bridge-gemini-', 'bridge-'));
-const VERDICT = join(OUT_DIR, `bridge-verdict${SUFFIX}.json`);
-const LOG = join(OUT_DIR, `bridge-run${SUFFIX}.log`);
+const STAGE_PREFIX = STAGE === 'en' ? 'en-' : '';
+const ROWS = join(OUT_DIR, `bridge-${STAGE_PREFIX}gemini${SUFFIX}.jsonl`.replace(`bridge-${STAGE_PREFIX}gemini-`, `bridge-${STAGE_PREFIX}`));
+const VERDICT = join(OUT_DIR, `bridge-${STAGE_PREFIX}verdict${SUFFIX}.json`);
+const LOG = join(OUT_DIR, `bridge-${STAGE_PREFIX}run${SUFFIX}.log`);
+const EXPECTED = STAGE === 'en' ? 84 : 108;
 const RULE = { min_auc: 0.85, spearman_slack: 0.10, reference: 'grok-vs-gpt on the same passages' };
 
 function analyze(log) {
@@ -36,10 +44,12 @@ function analyze(log) {
   const aucGpt = auc(originals.filter((r) => r.source_class === 'ai').map((r) => r.gpt?.ai_likeness).filter(Number.isFinite), originals.filter((r) => r.source_class === 'human').map((r) => r.gpt?.ai_likeness).filter(Number.isFinite));
   const aucGrok = auc(originals.filter((r) => r.source_class === 'ai').map((r) => r.grok?.ai_likeness).filter(Number.isFinite), originals.filter((r) => r.source_class === 'human').map((r) => r.grok?.ai_likeness).filter(Number.isFinite));
   const complete = rows.length;
-  const admitted = complete >= 100 && aucGemini !== null && rhoGeminiGpt !== null && rhoGrokGpt !== null
+  const admitted = complete >= Math.floor(EXPECTED * 0.93) && aucGemini !== null && rhoGeminiGpt !== null && rhoGrokGpt !== null
     && aucGemini >= RULE.min_auc && rhoGeminiGpt >= rhoGrokGpt - RULE.spearman_slack;
   const verdict = {
     computed_at: new Date().toISOString(),
+    stage: STAGE,
+    s1_arm: S1_ARM,
     rule: RULE,
     passages_scored: complete,
     originals: originals.length,
@@ -58,7 +68,7 @@ function analyze(log) {
     label: admitted ? 'panel-v2-deviation-gemini' : 'single-perceptual-judge',
   };
   writeFileSync(VERDICT, JSON.stringify(verdict, null, 2) + '\n');
-  log(`bridge verdict [${JUDGE_ID}]: scored ${complete}/108; AUC gemini ${fmt(aucGemini)} (gpt ${fmt(aucGpt)}, grok ${fmt(aucGrok)}); rho gemini-gpt ${fmt(rhoGeminiGpt)} vs grok-gpt ${fmt(rhoGrokGpt)} (gemini-grok ${fmt(rhoGeminiGrok)}); admitted=${admitted}`);
+  log(`bridge verdict [${JUDGE_ID}] stage ${STAGE}: scored ${complete}/${EXPECTED}; AUC gemini ${fmt(aucGemini)} (gpt ${fmt(aucGpt)}, grok ${fmt(aucGrok)}); rho gemini-gpt ${fmt(rhoGeminiGpt)} vs grok-gpt ${fmt(rhoGrokGpt)} (gemini-grok ${fmt(rhoGeminiGrok)}); admitted=${admitted}`);
   return verdict;
 }
 
@@ -70,8 +80,8 @@ async function main() {
   const log = makeLogger(LOG);
   if (process.argv.includes('--analyze')) { analyze(log); return; }
 
-  const s1Rows = readJsonl(join(S1_DIR, 's1-rows-D.jsonl'));
-  const texts = loadS1Texts('D');
+  const s1Rows = readJsonl(join(S1_DIR, `s1-rows-${S1_ARM}.jsonl`)).filter((r) => !EXCLUDED_REGISTERS.has(r.register));
+  const texts = loadS1Texts(S1_ARM);
   const passages = [];
   for (const r of s1Rows) {
     const t = texts.get(r.original_sha);
@@ -80,11 +90,11 @@ async function main() {
     if (r.rewrite_sha && t.rewritten) passages.push({ key: `${r.original_sha}:rewrite`, original_sha: r.original_sha, cond: 'rewrite', source_class: r.source_class, text: t.rewritten, archived: r.judges?.rewrite ?? {} });
   }
   const done = new Set(readJsonl(ROWS).filter((r) => r.gemini && Number.isFinite(r.gemini.ai_likeness)).map((r) => r.key));
-  log(`bridge start [${JUDGE_ID}] — ${passages.length} passages, ${done.size} already scored`);
+  log(`bridge start [${JUDGE_ID}] stage ${STAGE} (S1 arm ${S1_ARM}) — ${passages.length} passages, ${done.size} already scored`);
   let failures = 0;
   for (const p of passages) {
     if (done.has(p.key)) continue;
-    const gemini = await judgeOnce(JUDGE, p.text, 'ko');
+    const gemini = await judgeOnce(JUDGE, p.text, STAGE);
     if (gemini.error) {
       failures += 1;
       log(`${p.key}: gemini FAILED — ${gemini.error}`);
diff --git a/scripts/research/rewrite-efficacy-study4.mjs b/scripts/research/rewrite-efficacy-study4.mjs
index 9eee196e..e9f600ab 100644
--- a/scripts/research/rewrite-efficacy-study4.mjs
+++ b/scripts/research/rewrite-efficacy-study4.mjs
@@ -45,7 +45,12 @@ const PREFIX = SMOKE_FILE ? 's4-smoke' : 's4';
 const OUT_JSONL = join(OUT_DIR, `${PREFIX}-rows-${STAGE}.jsonl`);
 const TEXTS_JSONL = join(OUT_DIR, `${PREFIX}-texts-${STAGE}.private.jsonl`);
 const LOG = join(OUT_DIR, `${PREFIX}-run-${STAGE}.log`);
-const VERDICT = join(OUT_DIR, 'bridge-verdict.json');
+// Stage-specific bridge verdict for the admitted second judge (ko: the
+// gemini-3.7-flash amendment verdict; en: the en bridge). S4_JUDGES overrides.
+const VERDICT = join(OUT_DIR, STAGE === 'en' ? 'bridge-en-verdict-gemini-3.7-flash.json' : 'bridge-verdict-gemini-3.7-flash.json');
+// Pilot Deviation 4: the HAP-E `spok` register is not written prose; Study 1
+// excluded it and stage 2 inherits the exclusion (42 = 21 + 21 documents).
+const EXCLUDED_REGISTERS = new Set(['spok']);
 
 const REWRITE_TIMEOUT_MS = 900_000; // raised 600s -> 900s at doc 12 (S attempt 2 timeout), Study 3 precedent; execution note, no criterion change
 const FLOOR = 0.98;
@@ -197,7 +202,7 @@ async function judgeAll(judges, text, lang) {
 function resolveJudges(log) {
   if (process.env.S4_JUDGES) return process.env.S4_JUDGES.split(',').map((s) => s.trim()).filter(Boolean);
   if (process.env.S4_USE_GROK === '1') return ['judge-gpt', 'judge-grok'];
-  if (!existsSync(VERDICT)) throw new Error('bridge-verdict.json missing — run rewrite-efficacy-study4-bridge.mjs first (registered admission rule)');
+  if (!existsSync(VERDICT)) throw new Error(`${VERDICT} missing — run rewrite-efficacy-study4-bridge.mjs for this stage first (registered admission rule)`);
   const verdict = JSON.parse(readFileSync(VERDICT, 'utf8'));
   log(`bridge verdict ${verdict.label}: judges ${verdict.judges.join(', ')} (AUC gemini ${verdict.auc_gemini?.toFixed?.(3)}, rho gemini-gpt ${verdict.spearman_gemini_gpt?.toFixed?.(3)} vs grok-gpt ${verdict.spearman_grok_gpt?.toFixed?.(3)})`);
   return verdict.judges;
@@ -217,7 +222,7 @@ async function main() {
   const judges = resolveJudges(log);
   for (const id of judges) if (!JUDGE_DEFS[id]) throw new Error(`unknown judge ${id}`);
 
-  let s1Rows = readJsonl(join(S1_DIR, `s1-rows-${S1_ARM}.jsonl`)).filter((r) => r.original_sha);
+  let s1Rows = readJsonl(join(S1_DIR, `s1-rows-${S1_ARM}.jsonl`)).filter((r) => r.original_sha && !EXCLUDED_REGISTERS.has(r.register));
   let texts = loadS1Texts(S1_ARM);
   if (SMOKE_FILE) {
     const smokeText = readFileSync(SMOKE_FILE, 'utf8').trim();
diff --git a/scripts/research/study4-common.mjs b/scripts/research/study4-common.mjs
index 452a4483..4063e1d0 100644
--- a/scripts/research/study4-common.mjs
+++ b/scripts/research/study4-common.mjs
@@ -18,6 +18,9 @@ export const JUDGE_TIMEOUT_MS = 180_000;
 export const JUDGE_ATTEMPTS = 3;
 
 const HTTP_CLI = [join('scripts', 'research', 'judge-http-cli.mjs')];
+// Detached runners can start without nvm on PATH; resolve the gemini CLI once
+// (S3 did the same for codex). Falls back to a bare `gemini` lookup.
+const GEMINI_BIN = process.env.GEMINI_BIN || ['/home/devswha/.nvm/versions/node/v24.18.0/bin/gemini', join(process.env.HOME || '', '.nvm', 'versions', 'node', 'v24.18.0', 'bin', 'gemini')].find((p) => existsSync(p)) || 'gemini';
 const http = (id, family, baseURL, keyEnv, model) => ({
   id, family, cmd: 'node', args: HTTP_CLI,
   env: { JUDGE_BASE_URL: baseURL, JUDGE_API_KEY_ENV: keyEnv, JUDGE_MODEL: model },
@@ -25,7 +28,7 @@ const http = (id, family, baseURL, keyEnv, model) => ({
 
 export const JUDGE_DEFS = Object.freeze({
   'judge-gpt': { id: 'judge-gpt', family: 'gpt', cmd: 'codex', args: ['exec', '--skip-git-repo-check', '--sandbox', 'read-only'] },
-  'judge-gemini': { id: 'judge-gemini', family: 'gemini', cmd: 'gemini', args: ['-p', '', '--output-format', 'text', '--skip-trust', '--allowed-mcp-server-names', NO_MCP_SERVERS, '-m', 'gemini-2.5-pro'] },
+  'judge-gemini': { id: 'judge-gemini', family: 'gemini', cmd: GEMINI_BIN, args: ['-p', '', '--output-format', 'text', '--skip-trust', '--allowed-mcp-server-names', NO_MCP_SERVERS, '-m', 'gemini-2.5-pro'] },
   'judge-grok': { id: 'judge-grok', family: 'xai', cmd: 'node', args: [join('scripts', 'research', 'xai-cli.mjs')] },
   // Bridge candidates without xAI credit (2026-09-02 amendment): API judges on
   // the OpenAI-compatible endpoints patina's providers already use.
@@ -33,6 +36,12 @@ export const JUDGE_DEFS = Object.freeze({
   'judge-gemini-3.1-pro': http('judge-gemini-3.1-pro', 'gemini', 'https://generativelanguage.googleapis.com/v1beta/openai', 'GEMINI_API_KEY', 'gemini-3.1-pro-preview'),
   'judge-deepseek-v4-pro': http('judge-deepseek-v4-pro', 'deepseek', 'https://api.deepseek.com', 'DEEPSEEK_API_KEY', 'deepseek-v4-pro'),
   'judge-kimi-k3': http('judge-kimi-k3', 'moonshot', 'https://api.moonshot.ai/v1', 'KIMI_API_KEY', 'kimi-k3'),
+  // Same model as judge-gemini-3.7-flash through the gemini CLI. NOTE: on a
+  // machine where the CLI's auth type is gemini-api-key (or GEMINI_API_KEY is
+  // exported) this is API-key billed too — it is NOT a subscription path.
+  // Transport differs (CLI default sampling vs API temperature 0), so it is
+  // bridged separately before use. Not admitted for Study 4 (timeouts).
+  'judge-gemini-3.7-flash-cli': { id: 'judge-gemini-3.7-flash-cli', family: 'gemini', cmd: GEMINI_BIN, args: ['-p', '', '--output-format', 'text', '--skip-trust', '--allowed-mcp-server-names', NO_MCP_SERVERS, '-m', 'gemini-3.7-flash'] },
 });
 
 export const sha = (s) => createHash('sha256').update(s, 'utf8').digest('hex').slice(0, 16);