fix(rectification): unify discriminator question contract and rank by information gain

Python and TypeScript now share a four-option probe contract, persist Focus before asking, and pick the highest-value renderable probe instead of preferring low-gain career events over D24.

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

frontend/tests/rectification-eight-method.test.ts

@@ -1255,6 +1255,10 @@ test("public tool surface stays at 14 and new cases bind 10.0.13", () => {
   assert.match(skill, /D9\/D10 类型表是校时方法/);
   assert.doesNotMatch(skill, /±5 分钟确定性/);
   assert.doesNotMatch(skill, /KP 政策跳过不挡提出门/);
+  const tools = readFileSync(new URL("../src/mastra/rectification-v9-tools.ts", import.meta.url), "utf8");
+  assert.match(tools, /function agentVisibleLatestProjection/);
+  assert.match(tools, /candidate_contrast_packet: _packet/);
+  assert.match(tools, /current_probe: null/);
 });
 
 test("Mastra hides active candidates when the receipt range excludes one of them", () => {
@@ -1780,6 +1784,47 @@ test("answered duty language skips window D10 and uses remaining D24", () => {
   assert.doesNotMatch(plan.next_followup?.semantic_key ?? "", /varga\.d10/);
 });
 
+test("low-gain career event probe does not outrank a renderable high-gain D24 contrast probe", () => {
+  const plan = buildMethodFollowupPlan({
+    evidence: CLASSIC_COVERAGE.filter((item) => item.domain !== "horary"),
+    eventProbes: [{
+      ...CAREER_CONFLICT_PROBE,
+      year: 2023,
+      year_label: "2023 年前后",
+      semantic_key: "career.2023.dasha_activation",
+      information_gain: 0.56,
+      candidate_split_hash: "set-test:career:2023",
+    }],
+    contrastPacket: {
+      candidateSetVersion: "05:00-05:14",
+      vargaDifferences: [],
+      probes: [{
+        probeId: "contrast:varga.d24.05:00/05:07|05:10|05:14",
+        candidateSetVersion: "05:00-05:14",
+        question: "当前几个候选在学业盘上还分得开。",
+        expectedOutcomes: [
+          { outcomeId: "yes", supportsCandidateIds: ["05:00"], conflictsCandidateIds: ["05:07", "05:10", "05:14"] },
+          { outcomeId: "no", supportsCandidateIds: ["05:07", "05:10", "05:14"], conflictsCandidateIds: ["05:00"] },
+        ],
+        candidateSplitHash: "varga.d24.05:00/05:07|05:10|05:14",
+        informationGain: 2.503258,
+        sourceFeatures: [{ technique: "D24", calculationResultId: RESULT_ID }],
+        domain: "education",
+        year: null,
+        semanticKey: "varga.d24.05:00/05:07|05:10|05:14",
+        choiceKind: "event_quality",
+      }],
+    },
+    candidatesSeparated: false,
+  });
+  assert.equal(plan.next_followup?.semantic_key, "varga.d24.05:00/05:07|05:10|05:14");
+  assert.equal(plan.next_followup?.choice_frame?.option_d_answer_class, "unsure");
+  assert.equal(plan.next_followup?.choice_frame?.period, "当前这几个候选");
+  assert.match(plan.next_followup?.choice_frame?.prompt ?? "", /学业|考试发挥|学习压力/);
+  assert.doesNotMatch(plan.next_followup?.choice_frame?.prompt ?? "", /入职、升职/);
+  assert.ok((plan.next_followup?.selection_score ?? 0) > 0.56);
+});
+
 const DUMP_COVERAGE = [
   {
     status: "confirmed" as const,