fix(rectification): keep compare requests valid after style cards (BUG-577–580)

Engine asked_probe_keys no longer include varga split hashes that 400 the scorer, failed compares become visible and retry, user stop can still deliver a range on a stale snapshot, and holdout no longer reasks domains already in the ledger.

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

frontend/tests/rectification-holdout-renderable.test.ts

@@ -200,10 +200,8 @@ test("dated holdout asks validation with a renderable followup card", () => {
   assert.equal(decision.canConfirmExactMinute, false);
 
   const plan = holdoutFollowup(dossier);
-  assert.ok(plan.next_followup);
-  assert.ok(plan.next_followup.choice_frame, "holdout card must be renderable");
-  assert.equal(plan.next_followup.choice_frame.scoring, false);
-  assert.ok(plan.next_followup.choice_frame.prompt);
+  // BUG-580: 账本已覆盖 holdout 候选领域时不再出盘外核对卡，直接交付。
+  assert.equal(plan.next_followup, null);
 });
 
 test("passed holdout is a validated range, not a unique minute", () => {