chore: import DH V2 D5.6.4 production baseline

api-v3/test/unit/inspection-closing-integrity.test.ts

@@ -0,0 +1,20 @@
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+import test from 'node:test';
+
+test('D5 migration protects signatures, frozen findings and sealed acts', async () => {
+  const source = await readFile(
+    resolve(
+      process.cwd(),
+      'src/database/migrations/1787328000000-phase-d5-act-closing-signatures.ts',
+    ),
+    'utf8',
+  );
+  assert.match(source, /REVOKE UPDATE ON TABLE inspection_act_signatures/);
+  assert.match(source, /trg_inspection_acts_closed_immutable/);
+  assert.match(source, /trg_inspection_findings_frozen_fields/);
+  assert.match(source, /trg_inspection_evidence_observation_draft/);
+  assert.match(source, /uq_inspection_act_company_outcome/);
+  assert.match(source, /closure_sha256 ~ '\^\[0-9a-f\]\{64\}\$'/);
+});