fix(rectification): keep choice stems visible and align overlay adopt with the engine

Walkthrough polish: fail-closed empty D9 prompts, stop asserting the next question is on screen, vary same-domain collect copy, switch to reverse-verify after adopt, and let coverage route interview without blocking can_adopt.

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

frontend/tests/rectification-decision-authority.test.ts

@@ -548,7 +548,10 @@ test("nonterminal invariant 3: answer_choice response waits until incident fallb
   const parsedIncident = parseV9CaseDossier(raw);
   assert.ok(parsedIncident);
   const decision = decideFromDossier(parsedIncident);
-  assert.equal(decision.canAdopt, false);
+  // 原断言 canAdopt=false（coverage 未齐不得采用）→ 新断言 canAdopt=true。
+  // 问题 E 方案 1：coverage 只做问询路由，不挡 overlay 采用。确认门与引擎 ceiling 仍关。
+  // 本例仍继续采集家人层，nextAction 不得变成 offer_provisional_range。
+  assert.equal(decision.canAdopt, true);
   assert.notEqual(decision.nextAction, "offer_provisional_range");
 
   let activeFocus: Record<string, unknown> | null = null;
@@ -613,7 +616,9 @@ test("nonterminal invariant 3: answer_choice response waits until incident fallb
   assert.ok(refreshed);
   const currentQuestion = projectCurrentQuestion(refreshed.conversationSummary.activeFocus);
   assert.equal(response.status, 200);
-  assert.equal(decision.canAdopt, false);
+  // 原断言 canAdopt=false → 新断言 canAdopt=true（coverage 不再挡采用）。
+  // 保留语义：answer_choice 出口仍必须先把家人采集题干写入 focus/turn，再返回 HTTP。
+  assert.equal(decision.canAdopt, true);
   assert.ok(currentQuestion?.prompt);
   assert.equal(currentQuestion.prompt, "家里如果有结婚、添丁或住院这类事，记得大概哪年就行。");
   const historyTurn = accounting.calls.find((call) => call.fn === "append_agentic_rectification_turn");