fix(rectification): narrate the credible range and stop scoring periods by length (BUG-569–570)

Choice copy was comparing the search window, so every answer said the range had not changed. Block-scan summed raw scores, so longer afternoon windows won before any evidence difference.

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

frontend/src/lib/rectification-agentic/v9/answer-choice.ts

@@ -592,8 +592,8 @@ export async function applyRectificationChoice(
     appliedInference: persistable && scoring,
     answerClass,
     deltasByCluster: clusterScoreDeltas(previous.candidates, appliedScoreDeltas),
-    rangeBefore: [previous.range_start, previous.range_end],
-    rangeAfter: [applied.state.range_start, applied.state.range_end],
+    credibleBefore: previous.credible_range,
+    credibleAfter: applied.state.credible_range,
   });
   const evidenceFp = dossier.latestResult?.evidenceLedgerFingerprint
     ?? evidenceLedgerFingerprint(dossier.evidence);

frontend/src/lib/rectification-agentic/v9/choice-action.ts

@@ -102,8 +102,8 @@ export function composeChoiceNarration(input: {
   appliedInference: boolean;
   answerClass?: AnswerClass | null;
   deltasByCluster?: readonly ClusterScoreDelta[];
-  rangeBefore?: readonly [string, string] | null;
-  rangeAfter?: readonly [string, string] | null;
+  credibleBefore?: readonly [string, string] | null;
+  credibleAfter?: readonly [string, string] | null;
 }): string {
   if (input.optionId === "stop") {
     return `已记录你的选择，并结束本次校正，交付当前可信区间和代表性工作时间。${RECTIFICATION_TERMINATION_COPY}`;
@@ -119,7 +119,7 @@ export function composeChoiceNarration(input: {
   }
   if (input.appliedInference) {
     const movement = explainScoreMovement(input.deltasByCluster ?? []);
-    const range = explainRangeChange(input.rangeBefore, input.rangeAfter);
+    const range = explainRangeChange(input.credibleBefore, input.credibleAfter);
     if (movement || range) {
       return ["已记录你的选择", movement, range].filter(Boolean).join("。") + "。";
     }

frontend/src/lib/rectification-agentic/v9/probe-explain.ts

@@ -3,6 +3,7 @@
  * The model writes the stem; this module writes "why" and "what answering does".
  */
 
+import { publicRectificationMethodLabel } from "../../rectification-varga-sentence.ts";
 import type { AnswerClass } from "../core/types.ts";
 import type { DiscriminatingEventProbe, ProbeExpectedOutcome } from "./refinement-packet.ts";
 
@@ -31,11 +32,6 @@ export type ProbeUserExplain = Readonly<{
   answer_impact: ProbeAnswerImpact;
 }>;
 
-const TRACK_LABEL: Readonly<Record<string, string>> = {
-  vimshottari: "毗湿奴多利",
-  narayana: "那罗延",
-};
-
 const CLOCK = /^(?:[01]\d|2[0-3]):[0-5]\d$/;
 
 export const PROBE_EXPLAIN_COPY = {
@@ -91,7 +87,10 @@ function rangesForTimes(
 }
 
 function trackLabels(tracks: readonly string[] | undefined): string {
-  const labels = [...new Set((tracks ?? []).map((track) => TRACK_LABEL[track]).filter(Boolean))];
+  const labels = [...new Set((tracks ?? []).flatMap((track) => {
+    const label = publicRectificationMethodLabel(track);
+    return label ? [label] : [];
+  }))];
   return labels.join("、");
 }
 

frontend/src/lib/rectification-varga-sentence.ts

@@ -22,11 +22,17 @@ export const PUBLIC_RECTIFICATION_METHOD_LABELS: Readonly<Record<PublicRectifica
   "functional-benefic-malefic": "本命功能吉凶星",
 };
 
+export function publicRectificationMethodLabel(methodOrTrack: string): string | null {
+  const direct = PUBLIC_RECTIFICATION_METHOD_LABELS[methodOrTrack as PublicRectificationMethod];
+  if (direct) return direct;
+  return PUBLIC_RECTIFICATION_METHOD_LABELS[`${methodOrTrack}-dasha` as PublicRectificationMethod] ?? null;
+}
+
 export function vargaSentenceFromMethods(
   methods: readonly string[] | null | undefined,
 ): string | null {
   const labels = [...new Set((methods ?? []).flatMap((method) => {
-    const label = PUBLIC_RECTIFICATION_METHOD_LABELS[method as PublicRectificationMethod];
+    const label = publicRectificationMethodLabel(method);
     return label ? [label] : [];
   }))];
   if (labels.length === 0) return null;