fix(rectification): collect dated events, then distinguish with conflict probes

Empty ledgers stay in natural-language collection. After the first dated
event, dasha conflict probes reverse-infer 前事 and block offer until
answered. Unique-minute confirmation stays closed at a representative
time; adopt reverse-verifies remaining probes. Records BUG-348–351.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/rectification-agentic-chat.tsx

@@ -89,7 +89,7 @@ function RectificationCandidateCards({
     <section className="rectification-candidates" aria-label="生时校正候选时间">
       <div className="rectification-candidates-heading">
         <strong>当前可能的出生时间</strong>
-        <span>这次校正的结果是采用一个代表性时间作当前排盘。相邻分钟目前分不开，还不能确认唯一分钟。可以先采用，也可以继续补充事件或改选；新增证据后，候选和相对支持度会重新计算。</span>
+        <span>这次校正的收口是采用一个代表性时间作当前排盘。相邻分钟目前分不开，本会话以代表性时间收口，不确认唯一分钟。可以先采用，也可以继续补充事件或改选；新增证据后，候选和相对支持度会重新计算。</span>
         <span>相对支持度不是统计概率；采用不等于确认出生时间，也不会覆盖原始填报时间。</span>
       </div>
       <div className="rectification-candidate-list">
@@ -740,7 +740,7 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
       && Boolean(message.turnId)
       && Boolean(message.text)
     ))?.renderKey;
-  const latestOfferMessage = [...messages]
+  const latestSettledAssistant = [...messages]
     .reverse()
     .find((message) => (
       message.role === "assistant"
@@ -748,27 +748,29 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
       && !message.failed
       && Boolean(message.text)
     ));
-  const showSelectionCards = Boolean(
-    candidateResult?.selectionAllowed
-    && !candidateResult.selectedTime
-    && latestOfferMessage
-    && turnOfferedSelection(latestOfferMessage)
-    && !busy
-    && regeneratingMessageKey === null,
-  );
+  const offeredSelectionOnce = messages.some(turnOfferedSelection);
+  const offeredThisTurn = Boolean(latestSettledAssistant && turnOfferedSelection(latestSettledAssistant));
   const showChoiceCards = Boolean(
     choiceCard
-    && latestOfferMessage
-    && !showSelectionCards
+    && latestSettledAssistant
+    && !offeredThisTurn
     && !busy
     && !readonly
     && regeneratingMessageKey === null,
   );
-  const selectionCardMessageKey = showSelectionCards && latestOfferMessage
-    ? latestOfferMessage.renderKey
+  const showSelectionCards = Boolean(
+    candidateResult?.selectionAllowed
+    && offeredSelectionOnce
+    && latestSettledAssistant
+    && !showChoiceCards
+    && !busy
+    && regeneratingMessageKey === null,
+  );
+  const selectionCardMessageKey = showSelectionCards && latestSettledAssistant
+    ? latestSettledAssistant.renderKey
     : undefined;
-  const choiceCardMessageKey = showChoiceCards && latestOfferMessage
-    ? latestOfferMessage.renderKey
+  const choiceCardMessageKey = showChoiceCards && latestSettledAssistant
+    ? latestSettledAssistant.renderKey
     : undefined;
   const canSend = !busy && !readonly && !regeneratingMessageKey;
 
@@ -882,7 +884,7 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
           {savedTime && (
             <div className="rectification-saved-wrap">
               <p className="rectification-saved" role="status">
-                {savedStatus === "confirmed" ? "已确认校正时间" : "当前排盘时间（代表性候选，还不能确认唯一分钟）"}：{savedTime}。后续排盘将使用该时间；你仍可继续补充事件或改选其他候选。
+                {savedStatus === "confirmed" ? "已确认校正时间" : "当前排盘时间（代表性时间，本会话不确认唯一分钟）"}：{savedTime}。后续排盘将使用该时间；你仍可继续补充事件或改选其他候选。
               </p>
               {savedStatus === "accepted" && onStartConsultation && (
                 <div className="rectification-consult-handoff">

frontend/src/components/technique-audit-disclosure.tsx

@@ -72,7 +72,13 @@ export function ConfirmationGateDisclosure({
     <details className="technique-audit">
       <summary>
         唯一分钟确认门
-        <small>{gate.confirmation_allowed ? "已允许" : "未允许"}</small>
+        <small>
+          {gate.confirmation_allowed
+            ? "已允许"
+            : gate.unique_minute_path === "closed_at_representative"
+              ? "以代表性时间收口"
+              : "未允许"}
+        </small>
       </summary>
       <div className="technique-audit-panel">
         <table>