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-v9-engine-contract.test.ts

@@ -3,13 +3,16 @@ import test from "node:test";
 
 import {
   RectificationEngineError,
+  engineRequestBody,
   mergeVedastroValidateIntoReceipt,
   runV9CandidateScore,
   runV9Diagnostics,
   runV9VedastroValidate,
+  sanitizeAskedProbeKeysForEngine,
   toEngineEvents,
   type V9EngineScoreResult,
 } from "../src/lib/rectification-agentic/v9/engine-client.ts";
+import { askedSemanticKeysForEngine } from "../src/lib/rectification-agentic/v9/inference-adapter.ts";
 
 const RANGE = { start_time: "04:50", end_time: "05:10" };
 const CANDIDATE_ID = "88888888-8888-4888-8888-888888888881";
@@ -476,3 +479,35 @@ test("vedastro-validate keeps safe timeout, HTTP, and invalid-response failure c
     globalThis.fetch = previous;
   }
 });
+
+const VARGA_SPLIT_HASH = "04:45-05:15:04:47,04:51,04:53,04:59,05:00,05:06,05:08,05:13,05:15:varga.d9.04:47|04:51/05:00|05:06|04:59|04:53/05:08|05:13|05:15";
+
+test("engineRequestBody drops varga split hashes and keeps short semantic keys", () => {
+  assert.equal(VARGA_SPLIT_HASH.length, 128);
+  const receipt = {
+    inference_state: {
+      answered_probes: [{
+        probe_id: "contrast:varga.d9.style",
+        semantic_key: "varga.d9.style",
+        candidate_split_hash: VARGA_SPLIT_HASH,
+        answer_class: "yes",
+        classified_from: "choice",
+      }],
+    },
+  };
+  const semantic = askedSemanticKeysForEngine(receipt, []);
+  assert.deepEqual(semantic, ["varga.d9.style"]);
+  assert.equal(semantic.includes(VARGA_SPLIT_HASH), false);
+  const body = engineRequestBody({
+    baselineBirthSnapshot: SNAPSHOT,
+    candidateRange: RANGE,
+    events: toEngineEvents(EVIDENCE),
+    askedProbeKeys: [VARGA_SPLIT_HASH, "varga.d9.style", "k".repeat(201)],
+  });
+  const keys = body.asked_probe_keys as string[];
+  assert.ok(Array.isArray(keys));
+  assert.equal(keys.includes(VARGA_SPLIT_HASH), false);
+  assert.equal(keys.some((key) => key.includes(":varga.")), false);
+  assert.ok(keys.every((key) => key.length <= 120));
+  assert.deepEqual(sanitizeAskedProbeKeysForEngine([VARGA_SPLIT_HASH, "varga.d9.style"]), ["varga.d9.style"]);
+});