research(rectification): add reported-offset evaluation and frozen rerun integrity

Preserve closed confirmation gates and previously-exposed dataset boundaries. Add auditable 900-trial sensitivity results, current scorer freshness checks, and the v5 collection protocol.

Co-Authored-By: Claude Code <noreply@anthropic.com>

frontend/tests/rectification-confirmation-gate.test.ts

@@ -81,6 +81,13 @@ const diagnosticReport = JSON.parse(readFileSync(
     verified_minute_claim_allowed: boolean;
   };
 };
+const currentTreeRerun = JSON.parse(readFileSync(
+  new URL("../../docs/research/sealed_holdout_rerun_2026_09_20.json", import.meta.url),
+  "utf8",
+)) as {
+  frozen_record: { implementation_sha256: string };
+  official_valid_independent_blind: boolean;
+};
 type ProductHoldoutContract = typeof SEALED_MINUTE_HOLDOUT & {
   metrics_produced_by: {
     implementation_sha256: string;
@@ -190,10 +197,16 @@ test("sealed holdout aggregates match the v3 report and still block confirmation
     productHoldout.metrics_produced_by.source_report,
     "references/real_case_calibration/minute_rectification_holdout_v3_report.json",
   );
+  // 原值: 历史 sidecar 哈希 / 新值: 当前冻结重跑哈希 / 原因: BUG-978 身份新鲜度，不改变确认门。
   assert.equal(
     productHoldout.current_tree_scorer.implementation_sha256,
-    diagnosticReport.frozen_scoring.actual_sha256,
+    currentTreeRerun.frozen_record.implementation_sha256,
   );
+  assert.equal(
+    productHoldout.current_tree_scorer.source_report,
+    "docs/research/sealed_holdout_rerun_2026_09_20.json",
+  );
+  assert.equal(currentTreeRerun.official_valid_independent_blind, false);
   assert.equal(productHoldout.current_tree_scorer.matches_metrics_scorer, false);
   assert.equal(productHoldout.current_tree_scorer.official_eval_implementation_hash_matches, false);
   assert.equal(productHoldout.current_tree_scorer.official_eval_trial_count, diagnosticReport.trial_count);