fix: preview terminal low completion

frontend/src/lib/birth-time-dynamic-preview.ts

@@ -64,6 +64,19 @@ const highCandidate = {
   marginPercent: 24,
 } satisfies CandidateResult;
 
+const terminalLowCandidate = {
+  ...candidate,
+  confidence: "low",
+  winningSegment: {
+    startTime: "05:18",
+    endTime: "05:24",
+    representativeTime: "05:21",
+    widthMinutes: 7,
+  },
+  eventCount: 4,
+  domainCount: 3,
+} satisfies CandidateResult;
+
 function response(input: {
   readonly nextAction: DynamicNextAction;
   readonly phase: "question" | "clarification" | "scoring" | "result" | "ready" | "paused";
@@ -112,7 +125,7 @@ function response(input: {
 }
 
 export function dynamicBirthTimePreview(
-  state: "generating" | "question-retry" | "question" | "clarification" | "scoring" | "scoring-retry" | "low" | "medium" | "confirmation" | "ready" | "paused" = "question",
+  state: "generating" | "question-retry" | "question" | "clarification" | "scoring" | "scoring-retry" | "low" | "terminal-low" | "medium" | "confirmation" | "ready" | "paused" = "question",
 ): DynamicJourneyClientResponse {
   switch (state) {
     case "generating": return response({ nextAction: { kind: "generate_dynamic_question" }, phase: "question" });
@@ -122,6 +135,7 @@ export function dynamicBirthTimePreview(
     case "scoring": return response({ nextAction: { kind: "score_pending", jobId }, phase: "scoring", answeredCount: 1, effectiveAnswerCount: 1, turnVersion: 2 });
     case "scoring-retry": return response({ nextAction: { kind: "retry_scoring", jobId }, phase: "scoring", answeredCount: 1, effectiveAnswerCount: 1, turnVersion: 2 });
     case "low": return response({ nextAction: { kind: "present_low_result", resultId: null }, phase: "result", answeredCount: 2, effectiveAnswerCount: 1, snapshotState: "candidate", turnVersion: 3 });
+    case "terminal-low": return response({ nextAction: { kind: "present_low_result", resultId }, phase: "result", answeredCount: 4, effectiveAnswerCount: 3, candidateResult: terminalLowCandidate, snapshotState: "rectifying", turnVersion: 4 });
     case "medium": return response({ nextAction: { kind: "present_medium_result", resultId }, phase: "result", answeredCount: 3, effectiveAnswerCount: 2, candidateResult: candidate, snapshotState: "candidate", turnVersion: 4 });
     case "confirmation": return response({ nextAction: { kind: "request_candidate_confirmation", resultId }, phase: "result", answeredCount: 4, effectiveAnswerCount: 4, candidateResult: highCandidate, snapshotState: "confirming", turnVersion: 5 });
     case "ready": return response({ nextAction: { kind: "ready", activeTime: "05:43" }, phase: "ready", answeredCount: 4, effectiveAnswerCount: 4, candidateResult: highCandidate, snapshotState: "ready", activeTime: "05:43", turnVersion: 6 });

frontend/src/lib/birth-time-guided-preview.ts

@@ -91,6 +91,7 @@ export function isGuidedBirthTimePreview(mode: string): boolean {
 
 export function guidedBirthTimePreview(mode: string): JourneyClientResponse {
   if (mode === "birth-time-rectification") return dynamicBirthTimePreview();
+  if (mode === "birth-time-rectification-low") return dynamicBirthTimePreview("terminal-low");
   if (mode === "birth-time-rectification-draft" || mode === "birth-time-rectification-events") {
     return response({
       snapshot: { ...response().snapshot, input: "life_events", assistantIntent: "collect_dated_life_events" },

frontend/tests/birth-time-rectification-contract.test.ts

@@ -4,6 +4,7 @@ import {
   guidedBirthTimePreview,
   isGuidedBirthTimePreview,
 } from "../src/lib/birth-time-guided-preview.ts";
+import { guidedTerminalPath } from "../src/lib/birth-time-guided-terminal.ts";
 
 test("development previews cover every guided state with legal persisted actions", () => {
   const expectedActions = new Map([
@@ -24,3 +25,19 @@ test("development previews cover every guided state with legal persisted actions
   }
   assert.equal(guidedBirthTimePreview("birth-time-rectification").journeyProtocol, "dynamic-choice-v2");
 });
+
+test("low-confidence preview mirrors the persisted dynamic terminal state", () => {
+  const low = guidedBirthTimePreview("birth-time-rectification-low");
+
+  assert.equal(low.journeyProtocol, "dynamic-choice-v2");
+  assert.equal(low.snapshot.state, "rectifying");
+  assert.equal(low.nextAction.kind, "present_low_result");
+  assert.ok(low.candidateResult);
+  assert.equal(low.nextAction.resultId, low.candidateResult.resultId);
+  assert.deepEqual(guidedTerminalPath(low), {
+    kind: "complete_with_candidate",
+    time: low.candidateResult.winningSegment?.representativeTime,
+    preservesCase: true,
+    appliesCandidateTime: true,
+  });
+});