fix: prevent repeated birth-time assessment loops

frontend/src/app/page.tsx

@@ -86,6 +86,19 @@ type Profile = BirthTimeDraft & {
   districtCode: string;
   rectificationCaseId: string;
 };
+
+function birthTimeAssessmentSignature(value: BirthTimeDraft) {
+  return [
+    value.date,
+    value.time,
+    value.reportedTime,
+    value.birthTimeSource,
+    value.birthTimePeriod,
+    value.birthTimeClue,
+    value.uncertaintyBeforeMinutes,
+    value.uncertaintyAfterMinutes,
+  ].join("|");
+}
 type ChartLibraryRecord = {
   id: string;
   role: "self" | "other";
@@ -741,6 +754,7 @@ export default function Home() {
   const uiPreview = useRef(false);
   const uiPreviewMode = useRef<string | null>(null);
   const birthTimeRevisionPending = useRef(false);
+  const lastBirthTimeAssessmentSignature = useRef("");
   const birthTimeGuided = useBirthTimeGuidedJourney({
     journey: birthTimeJourney,
     preview: process.env.NODE_ENV === "development" && uiPreview.current,
@@ -1542,6 +1556,7 @@ export default function Home() {
       rectificationCaseId: result.caseId,
     };
     setBirthTimeJourney(result);
+    lastBirthTimeAssessmentSignature.current = birthTimeAssessmentSignature(nextProfile);
     setBirthTimeError("");
     setProfile(assessedProfile);
     setProfileDraft(assessedProfile);
@@ -1603,6 +1618,12 @@ export default function Home() {
     try {
       await persistProfile(profileDraft);
       if (birthTimeRevisionPending.current) {
+        if (lastBirthTimeAssessmentSignature.current === birthTimeAssessmentSignature(profileDraft)) {
+          birthTimeRevisionPending.current = false;
+          setBirthTimeError("出生资料未变化，重新评估会重复同一结果。请补充不同领域且能注明年月的关键经历，再继续校时。");
+          setOnboardingStep("rectification");
+          return;
+        }
         setBirthTimeAssessmentPhase("assessing");
         const assessedProfile = await assessSavedBirthTime(profileDraft);
         birthTimeRevisionPending.current = false;

frontend/src/components/birth-time-candidate-result.tsx

@@ -124,8 +124,8 @@ function TerminalAction({ controller, error, path }: {
   return (
     <div className="birth-time-new-assessment">
       <b>尚未达到采用条件</b>
-      <p>候选范围已保留，但当前证据不足以将具体分钟写入当前排盘时间。补充经历后可重新评估。</p>
-      <button className="button-secondary birth-time-guided-action" disabled={controller.pending} onClick={controller.editBirthTimeDetails} type="button">开始新的评估</button>
+      <p>候选范围已保留，但当前证据不足以将具体分钟写入当前排盘时间。请补充不同领域、可注明年月的关键经历；仅重复原出生资料不会生成新结果。</p>
+      <button className="button-secondary birth-time-guided-action" disabled={controller.pending} onClick={controller.editBirthTimeDetails} type="button">修改出生资料后重新评估</button>
       {error ? <p className="form-error" role="alert">{error}</p> : null}
       <small>会建立新的记录，当前结果仍会保留。</small>
     </div>

frontend/src/hooks/use-birth-time-automatic-journey-effects.ts

@@ -16,6 +16,7 @@ import {
 } from "@/lib/birth-time-guided-effect-coordinator";
 import type { StableActionIdentityRegistry } from "@/lib/birth-time-guided-effect-coordinator";
 import { runBirthTimeScoringPoll, scoringPollDelay } from "@/lib/birth-time-guided-polling";
+import { birthTimeUserError } from "@/lib/birth-time-user-error";
 
 type AutomaticEffectsInput = {
   readonly journey: JourneyClientResponse | null;
@@ -82,7 +83,7 @@ export function useBirthTimeAutomaticJourneyEffects(input: AutomaticEffectsInput
       if (publishCurrentJourney({ expected, current: latest.current, next, publish: onJourney })) latest.current = next;
     }).catch((caught: unknown) => {
       if (latest.current?.caseId === expected.caseId && latest.current.turnVersion === expected.turnVersion) {
-        setError(caught instanceof Error ? caught.message : "暂时无法生成下一题，请重试。");
+        setError(birthTimeUserError(caught));
       }
     });
   }, [actionRegistry, generationIdentity, generationRequests, generationRun, latest, onJourney, preview, setError]);
@@ -114,7 +115,7 @@ export function useBirthTimeAutomaticJourneyEffects(input: AutomaticEffectsInput
         latest.current = result.turn;
         if (result.kind === "exhausted") setError("评分仍在进行。你可以稍后继续，或重新检查状态。");
       }).catch((caught: unknown) => {
-        if (!controller.signal.aborted) setError(caught instanceof Error ? caught.message : "暂时无法读取评分进度，请稍后重试。");
+        if (!controller.signal.aborted) setError(birthTimeUserError(caught));
       });
     });
     return () => { cancelStart(); controller.abort(); };

frontend/tests/birth-time-user-errors.test.ts

@@ -18,4 +18,6 @@ test("all guided journey mutations normalize implementation errors", () => {
   const source = readFileSync(new URL("../src/hooks/use-birth-time-guided-journey.ts", import.meta.url), "utf8");
   assert.ok((source.match(/setError\(birthTimeUserError\(caught\)\)/g) ?? []).length >= 1);
   assert.equal(source.includes("setError(caught.message"), false);
+  const automatic = readFileSync(new URL("../src/hooks/use-birth-time-automatic-journey-effects.ts", import.meta.url), "utf8");
+  assert.equal((automatic.match(/setError\(birthTimeUserError\(caught\)\)/g) ?? []).length, 2);
 });