fix(rectification): use candidate dates for cross-midnight dasha scoring

Add date-isolated caches and regression coverage, align scoring identity, and freeze full research reruns while preserving historical artifacts. Record unresolved cache/receipt identity and end-to-end acceptance gaps for branch review only.

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

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

@@ -81,8 +81,11 @@ const diagnosticReport = JSON.parse(readFileSync(
     verified_minute_claim_allowed: boolean;
   };
 };
+// 原值：docs/research/sealed_holdout_rerun_2026_09_20.json
+// 新值：docs/research/sealed_holdout_rerun_cross_midnight_2026_09_20.json
+// 原因：BUG-981 修复后重跑另存报告；旧报告保留，确认门行为与阈值不变。
 const currentTreeRerun = JSON.parse(readFileSync(
-  new URL("../../docs/research/sealed_holdout_rerun_2026_09_20.json", import.meta.url),
+  new URL("../../docs/research/sealed_holdout_rerun_cross_midnight_2026_09_20.json", import.meta.url),
   "utf8",
 )) as {
   frozen_record: { implementation_sha256: string };
@@ -204,7 +207,7 @@ test("sealed holdout aggregates match the v3 report and still block confirmation
   );
   assert.equal(
     productHoldout.current_tree_scorer.source_report,
-    "docs/research/sealed_holdout_rerun_2026_09_20.json",
+    "docs/research/sealed_holdout_rerun_cross_midnight_2026_09_20.json",
   );
   assert.equal(currentTreeRerun.official_valid_independent_blind, false);
   assert.equal(productHoldout.current_tree_scorer.matches_metrics_scorer, false);