diff --git a/AGENTS.md b/AGENTS.md
index 5adb890..109bd14 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -21,7 +21,7 @@ npm ci
 npm run verify
 ```
 
-Gate non-mutating и последовательно проверяет runtime, hygiene, ESLint, application/test TypeScript, risk-based Jest suite и build. `npm run lint:fix` и `npm run format` изменяют files и выполняются только явно; `npm run test:cov` — диагностика без общего threshold. `npm run test:e2e` не входит в passing gate до WL-P2-05 trigger из remediation registry.
+Gate non-mutating и последовательно проверяет ESLint, application/test TypeScript, risk-based Jest suite и build. `npm run lint:fix` и `npm run format` изменяют files и выполняются только явно; `npm run test:cov` — диагностика без общего threshold. `npm run test:e2e` не входит в passing gate до WL-P2-05 trigger из remediation registry. `npm run test:openapi-contract` — отдельный contract gate для изменений обеих сторон API contract.
 Актуальные scripts проверять в `package.json`/`npm run`.
 
 ## Enforceable boundaries
diff --git a/README.md b/README.md
index 995fa21..5fc4467 100644
--- a/README.md
+++ b/README.md
@@ -47,8 +47,8 @@ engine останавливает migration до запуска Jest. Точны
 Из workspace runtime OpenAPI можно read-only сверить с frontend snapshot:
 
 ```bash
-bash specs/scripts/verify-runtime-openapi.sh
+npm run test:openapi-contract
 ```
 
 Полный multi-repository change проверяется из workspace через
-`bash specs/scripts/verify-workspace-change.sh <change>`.
+native OpenSpec validation and the canonical gates of each affected repository.
diff --git a/package.json b/package.json
index 607769f..1527da7 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,6 @@
     "node": "22.x"
   },
   "scripts": {
-    "runtime:check": "node scripts/verify-node-version.mjs",
     "build": "prisma generate && nest build",
     "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
     "start": "nest start",
@@ -19,7 +18,6 @@
     "lint": "npm run lint:check",
     "lint:check": "eslint \"{src,apps,libs,test}/**/*.ts\" --max-warnings=0",
     "lint:fix": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
-    "hygiene:check": "node scripts/repository-hygiene-check.mjs",
     "typecheck:app": "tsc --project tsconfig.typecheck.app.json",
     "typecheck:test": "tsc --project tsconfig.typecheck.test.json",
     "test": "jest",
@@ -27,7 +25,8 @@
     "test:cov": "jest --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
     "test:e2e": "DATABASE_URL=file:/tmp/wealth-ledger-e2e.db prisma migrate deploy && NODE_ENV=development NODE_OPTIONS=--experimental-vm-modules jest --config ./test/jest-e2e.json",
-    "verify": "npm run runtime:check && npm run hygiene:check && npm run lint && npm run typecheck:app && npm run typecheck:test && npm test -- --runInBand && npm run build"
+    "test:openapi-contract": "NODE_OPTIONS=--experimental-vm-modules jest --config ./test/jest-e2e.json --runInBand openapi-contract.e2e-spec.ts",
+    "verify": "npm run lint && npm run typecheck:app && npm run typecheck:test && npm test -- --runInBand && npm run build"
   },
   "dependencies": {
     "@grpc/grpc-js": "^1.14.4",
diff --git a/scripts/repository-hygiene-check.mjs b/scripts/repository-hygiene-check.mjs
deleted file mode 100644
index 1197bdc..0000000
--- a/scripts/repository-hygiene-check.mjs
+++ /dev/null
@@ -1,60 +0,0 @@
-import { execFileSync } from 'node:child_process';
-import { fileURLToPath } from 'node:url';
-import { dirname, resolve } from 'node:path';
-
-const root = resolve(dirname(fileURLToPath(import.meta.url)), '..');
-
-function git(args) {
-  return execFileSync('git', args, { cwd: root, encoding: 'utf8' }).trim();
-}
-
-function isIgnored(file) {
-  try {
-    execFileSync('git', ['check-ignore', '--no-index', '-q', file], {
-      cwd: root,
-      stdio: 'ignore',
-    });
-    return true;
-  } catch (error) {
-    if (error.status === 1) return false;
-    throw error;
-  }
-}
-
-function assert(condition, message) {
-  if (!condition) throw new Error(message);
-}
-
-const trackedDatabases = git([
-  'ls-files',
-  '--',
-  'dev.db',
-  'dev.db-*',
-  'prisma/*.db',
-  'prisma/*.db-*',
-])
-  .split('\n')
-  .filter(Boolean);
-
-assert(
-  trackedDatabases.length === 0,
-  `Runtime SQLite files in supported locations must not be tracked; found: ${trackedDatabases.join(', ')}`,
-);
-
-for (const file of [
-  'dev.db',
-  'dev.db-wal',
-  'dev.db-shm',
-  'prisma/dev.db',
-  'prisma/dev.db-wal',
-  'prisma/dev.db-shm',
-]) {
-  assert(isIgnored(file), `Runtime SQLite file must be ignored: ${file}`);
-}
-
-assert(
-  !isIgnored('test/fixtures/reference.db'),
-  'Intentional fixture must remain versionable',
-);
-
-console.log('Backend repository hygiene verified');
diff --git a/scripts/verify-node-version.mjs b/scripts/verify-node-version.mjs
deleted file mode 100644
index d940889..0000000
--- a/scripts/verify-node-version.mjs
+++ /dev/null
@@ -1,26 +0,0 @@
-import { readFileSync } from 'node:fs';
-import { fileURLToPath } from 'node:url';
-import { dirname, resolve } from 'node:path';
-
-const root = resolve(dirname(fileURLToPath(import.meta.url)), '..');
-const packageJson = JSON.parse(readFileSync(resolve(root, 'package.json'), 'utf8'));
-const nvmVersion = readFileSync(resolve(root, '.nvmrc'), 'utf8').trim();
-const expectedMajor = nvmVersion.replace(/^v/, '').split('.')[0];
-const expectedEngine = `${expectedMajor}.x`;
-
-if (packageJson.engines?.node !== expectedEngine) {
-  throw new Error(
-    `Node runtime contracts disagree: .nvmrc=${nvmVersion}, package.json engines.node=${packageJson.engines?.node ?? 'missing'}`,
-  );
-}
-
-const actualVersion = process.versions.node;
-const actualMajor = actualVersion.split('.')[0];
-if (actualMajor !== expectedMajor) {
-  console.error(
-    `Unsupported Node.js runtime: expected ${expectedEngine}, actual ${actualVersion}. Activate .nvmrc before running repository checks.`,
-  );
-  process.exit(1);
-}
-
-console.log(`Node.js runtime verified: ${actualVersion} (${expectedEngine})`);
diff --git a/test/openapi-contract.e2e-spec.ts b/test/openapi-contract.e2e-spec.ts
new file mode 100644
index 0000000..e09eb34
--- /dev/null
+++ b/test/openapi-contract.e2e-spec.ts
@@ -0,0 +1,52 @@
+import { INestApplication } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
+import { readFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+import { AppModule } from './../src/app.module';
+import { configureApp } from './../src/main';
+
+function canonicalize(value: unknown): unknown {
+  if (Array.isArray(value)) return value.map(canonicalize);
+  if (value && typeof value === 'object') {
+    return Object.fromEntries(
+      Object.entries(value)
+        .sort(([left], [right]) => left.localeCompare(right))
+        .map(([key, nestedValue]) => [key, canonicalize(nestedValue)]),
+    );
+  }
+  return value;
+}
+
+describe('OpenAPI contract (integration)', () => {
+  let app: INestApplication;
+
+  beforeAll(async () => {
+    const module = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+    app = module.createNestApplication();
+    configureApp(app);
+    await app.init();
+  });
+
+  afterAll(() => app.close());
+
+  it('matches the committed frontend OpenAPI snapshot', async () => {
+    const runtimeDocument = SwaggerModule.createDocument(
+      app,
+      new DocumentBuilder()
+        .setTitle('WealthLedger API')
+        .setVersion('v1')
+        .build(),
+    );
+    const snapshot = JSON.parse(
+      await readFile(
+        resolve(__dirname, '../../frontend/src/shared/api/spec/openapi.json'),
+        'utf8',
+      ),
+    ) as unknown;
+
+    expect(canonicalize(runtimeDocument)).toEqual(canonicalize(snapshot));
+  });
+});