diff --git a/docs/BUG_HISTORY.md b/docs/BUG_HISTORY.md
index 342b94a5..457e1651 100644
--- a/docs/BUG_HISTORY.md
+++ b/docs/BUG_HISTORY.md
@@ -9934,8 +9934,8 @@
 - 用户现象：报告宽度跟区间两端对得上，引擎「不可分宽度」却按各簇代表分钟算，少算两端延伸；极端时可把 ≤5 分钟的确认门误开。
 - 触发条件：各簇 `cluster_start` / `cluster_end` 超出代表分钟。
 - 根因：宽度公式用代表分钟的 `max-min+1`，不是簇覆盖。
-- 修复：改为 `max(cluster_end)-min(cluster_start)+1`；缺簇字段时回退到 `time`。`tied_minute_count` 不动。
-- 验证：`tests/test_rectification_confirmation_and.py`、`frontend/tests/rectification-delivery-report-facts.test.ts`、`rectification-confirmation-gate.test.ts`。
+- 修复：改为 `max(cluster_end)-min(cluster_start)+1`；缺簇字段时回退到 `time`。`tied_minute_count` 不动。决策层与客户端解析把 `clusterStart` / `clusterEnd` 传进确认门。
+- 验证：`tests/test_rectification_confirmation_and.py`、`frontend/tests/rectification-delivery-report-facts.test.ts`、`rectification-confirmation-gate.test.ts`、`rectification-candidate-result.test.ts`。
 - 防复发：两簇 04:50–04:55 与 04:56–05:02 必须得到 13，不得算成 7。确认门不得因代表分钟看起来相邻而打开。
 - 相关记录：BUG-593
 - 复发自：无
diff --git a/docs/tasks/PROGRESS-rectification-latent-audit-20260910.md b/docs/tasks/PROGRESS-rectification-latent-audit-20260910.md
index 9393b3e4..24f29005 100644
--- a/docs/tasks/PROGRESS-rectification-latent-audit-20260910.md
+++ b/docs/tasks/PROGRESS-rectification-latent-audit-20260910.md
@@ -19,7 +19,7 @@ Python 按 **argmax 映射到所在簇** 比较，不改成代表分钟列表。
 
 - **BUG-637**：账本派生的精确 `domain.year` 键只拦存在性探针。`known_event_quality` / `event_quality` 用 `askedKeysForSameYearDedup` 去掉这些键后再做同年去重；已答质量键仍丢。`remainingConflictProbes` 本来就跳过质量题，未改。不改 `SCORE_DELTA`、四选项、确认门。
 - **BUG-638**：`dasha_agreement(..., clusters=)` 与 TS `dashaAgreementAmongActive(..., clusters)` 按簇比较。`decision_policy` 把 `candidate_decisions` 传入 `build_refinement_packet`。引擎原值仍是 `dasha_agreement_pre_inference`。BUG-593 记录已补正。
-- **BUG-639**：`indistinguishable_width_minutes` / `indistinguishableWidthMinutes` 用 `max(cluster_end)-min(cluster_start)+1`；缺字段回退到 `time`。`tied_minute_count` 不动。
+- **BUG-639**：`indistinguishable_width_minutes` / `indistinguishableWidthMinutes` 用 `max(cluster_end)-min(cluster_start)+1`；缺字段回退到 `time`。`tied_minute_count` 不动。`decideFromDossier` 与 `parseRectificationCandidateResult` 把 `clusterStart` / `clusterEnd` 传进确认门，避免刷新路径只按代表分钟少算。
 - **BUG-640**：推断代表分钟 ≠ 引擎代表分钟时，公开 `house_table` / `natal_recast` 跟推断分钟；引擎原值改名 `*_pre_inference`。Agent 可见投影剥掉这三个字段。不改引擎。
 - 记录：BUG-389/593/637～640、CHANGELOG、本文件。Skill 版本不变（`10.0.21`）。
 
diff --git a/frontend/src/lib/rectification-agentic/v9/decision-from-dossier.ts b/frontend/src/lib/rectification-agentic/v9/decision-from-dossier.ts
index 2f558255..0ab85dc7 100644
--- a/frontend/src/lib/rectification-agentic/v9/decision-from-dossier.ts
+++ b/frontend/src/lib/rectification-agentic/v9/decision-from-dossier.ts
@@ -96,6 +96,10 @@ export type DecisionDossier = Readonly<{
       relativeSupport?: number;
       posterior_score?: number;
       tiedMinuteCount?: number;
+      clusterStart?: string;
+      clusterEnd?: string;
+      cluster_start?: string;
+      cluster_end?: string;
     }>[];
     representativeTime?: string | null;
     evidenceLedgerFingerprint?: string | null;
@@ -667,6 +671,12 @@ export function decideFromDossier(
       time: candidate.time,
       rank: candidate.rank ?? Number.MAX_SAFE_INTEGER,
       tiedMinuteCount: candidate.tiedMinuteCount ?? Number.MAX_SAFE_INTEGER,
+      ...(candidate.clusterStart ?? candidate.cluster_start
+        ? { clusterStart: candidate.clusterStart ?? candidate.cluster_start }
+        : {}),
+      ...(candidate.clusterEnd ?? candidate.cluster_end
+        ? { clusterEnd: candidate.clusterEnd ?? candidate.cluster_end }
+        : {}),
     })),
     decisionReceipt: latest?.decisionReceipt ?? null,
   });
diff --git a/frontend/src/lib/rectification-agentic/v9/method-followup.ts b/frontend/src/lib/rectification-agentic/v9/method-followup.ts
index 79fb8bba..dd455153 100644
--- a/frontend/src/lib/rectification-agentic/v9/method-followup.ts
+++ b/frontend/src/lib/rectification-agentic/v9/method-followup.ts
@@ -115,7 +115,6 @@ import {
   isEventQualityProbe,
   sameYearProbeAsked,
   SEMANTIC_YEAR_KEY,
-  EXISTENCE_STYLE_OPTIONS,
   type DroppedProbe,
   type ProbeStyleOption,
 } from "./probe-question-contract.ts";
diff --git a/frontend/src/lib/rectification-candidate-result.ts b/frontend/src/lib/rectification-candidate-result.ts
index 6b8fe076..b09556ac 100644
--- a/frontend/src/lib/rectification-candidate-result.ts
+++ b/frontend/src/lib/rectification-candidate-result.ts
@@ -44,6 +44,8 @@ export type RectificationCandidate = Readonly<{
   time: string;
   relativeSupport: number;
   tiedMinuteCount: number;
+  clusterStart?: string;
+  clusterEnd?: string;
 }>;
 
 export type RectificationHouseRow = Readonly<{
@@ -329,7 +331,17 @@ export function parseRectificationCandidateResult(value: unknown): Rectification
       || relativeSupport === null || !Number.isInteger(relativeSupport) || relativeSupport < 0 || relativeSupport > 100
       || tiedMinuteCount === null || !Number.isInteger(tiedMinuteCount) || tiedMinuteCount < 1
     ) return null;
-    candidates.push({ candidateId, rank, time: candidateTime, relativeSupport, tiedMinuteCount });
+    const clusterStart = time(candidate.clusterStart ?? candidate.cluster_start);
+    const clusterEnd = time(candidate.clusterEnd ?? candidate.cluster_end);
+    candidates.push({
+      candidateId,
+      rank,
+      time: candidateTime,
+      relativeSupport,
+      tiedMinuteCount,
+      ...(clusterStart ? { clusterStart } : {}),
+      ...(clusterEnd ? { clusterEnd } : {}),
+    });
   }
 
   const receipt = receiptFromSnapshot(snapshot);
diff --git a/frontend/tests/rectification-candidate-result.test.ts b/frontend/tests/rectification-candidate-result.test.ts
index 1ee5b16f..41b13270 100644
--- a/frontend/tests/rectification-candidate-result.test.ts
+++ b/frontend/tests/rectification-candidate-result.test.ts
@@ -343,4 +343,38 @@ test("inference marks are empty when inference_state is absent", () => {
   assert.deepEqual(result.inferenceMarks, []);
 });
 
+test("parsed candidates keep cluster span so confirmation width is not undercounted", () => {
+  const result = parseRectificationCandidateResult({
+    ...camelCaseSnapshot,
+    candidates: [
+      {
+        candidateId: CANDIDATE_ID,
+        rank: 1,
+        time: "04:53",
+        relativeSupport: 40,
+        tiedMinuteCount: 1,
+        clusterStart: "04:50",
+        clusterEnd: "04:55",
+      },
+      {
+        candidateId: SECOND_CANDIDATE_ID,
+        rank: 2,
+        time: "04:59",
+        relativeSupport: 39,
+        tiedMinuteCount: 1,
+        clusterStart: "04:56",
+        clusterEnd: "05:02",
+      },
+    ],
+  });
+  assert.ok(result);
+  assert.equal(result.candidates[0]?.clusterStart, "04:50");
+  assert.equal(result.candidates[0]?.clusterEnd, "04:55");
+  const adjacent = result.confirmationGate.blockers.find(
+    (row) => row.id === "adjacent_minutes_indistinguishable",
+  );
+  assert.equal(adjacent?.indistinguishable_width_minutes, 13);
+  assert.equal(result.confirmationGate.confirmation_allowed, false);
+});
+
 
diff --git a/frontend/tests/rectification-confirmation-gate.test.ts b/frontend/tests/rectification-confirmation-gate.test.ts
index 259ed645..abd754d4 100644
--- a/frontend/tests/rectification-confirmation-gate.test.ts
+++ b/frontend/tests/rectification-confirmation-gate.test.ts
@@ -414,6 +414,15 @@ test("holdout not_ready forbids unique-minute copy and still blocks confirm", as
   assert.equal(safeToolErrorCode(new RectificationToolServiceError("confirmation_blocked")), "confirmation_blocked");
 });
 
+test("decideFromDossier passes cluster span into the confirmation gate", () => {
+  const src = readFileSync(
+    new URL("../src/lib/rectification-agentic/v9/decision-from-dossier.ts", import.meta.url),
+    "utf8",
+  );
+  assert.match(src, /clusterStart: candidate\.clusterStart \?\? candidate\.cluster_start/);
+  assert.match(src, /clusterEnd: candidate\.clusterEnd \?\? candidate\.cluster_end/);
+});
+
 test("confirmation width uses cluster span so representative minutes cannot open the gate", () => {
   const candidates = [
     { time: "04:53", rank: 1, tiedMinuteCount: 1, clusterStart: "04:50", clusterEnd: "04:55" },