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-decide-next-action.test.ts

@@ -315,7 +315,12 @@ test("user stop skips remaining collection and holdout when candidates already e
     ],
     holdoutValidation: "not_started",
   });
-  assert.equal(stopped.sessionOutcome, "provisional_range_user_stopped");
+  // 原断言 sessionOutcome=provisional_range_user_stopped
+  // → 新断言 sessionOutcome=adopt_representative。
+  // coverage 不再挡代表性采用；completionStatus 仍标记用户停止。确认门仍关。
+  assert.equal(stopped.sessionOutcome, "adopt_representative");
+  assert.equal(stopped.canAdopt, true);
+  assert.equal(stopped.canConfirmExactMinute, false);
   assert.equal(stopped.completionStatus, "provisional_range_user_stopped");
   assert.equal(stopped.validated, false);
 });