diff --git a/.github/workflows/ci-scope-parity.yml b/.github/workflows/ci-scope-parity.yml
index e8efde9f15..cffdeb3415 100644
--- a/.github/workflows/ci-scope-parity.yml
+++ b/.github/workflows/ci-scope-parity.yml
@@ -11,7 +11,8 @@ name: Scope Resolution Parity
 # TWICE on every PR:
 #
 #   1. `REGISTRY_PRIMARY_<LANG>=0` — legacy DAG path (guarantees we haven't
-#      broken the old path while migrating).
+#      broken the old path while migrating). Known legacy gaps may be skipped
+#      through the resolver test helper's expected-failure list.
 #   2. `REGISTRY_PRIMARY_<LANG>=1` — registry-primary path (guarantees the
 #      new path carries the same behavior — the parity gate).
 #
diff --git a/gitnexus/test/integration/resolvers/csharp.test.ts b/gitnexus/test/integration/resolvers/csharp.test.ts
index 1d41bb1708..3b8feb812a 100644
--- a/gitnexus/test/integration/resolvers/csharp.test.ts
+++ b/gitnexus/test/integration/resolvers/csharp.test.ts
@@ -1,11 +1,12 @@
 /**
  * C#: heritage resolution via base_list + ambiguous namespace-import refusal
  */
-import { describe, it, expect, beforeAll } from 'vitest';
+import { describe, expect, beforeAll } from 'vitest';
 import path from 'path';
 import {
   FIXTURES,
   CROSS_FILE_FIXTURES,
+  createResolverParityIt,
   getRelationships,
   getNodesByLabel,
   getNodesByLabelFull,
@@ -14,6 +15,8 @@ import {
   type PipelineResult,
 } from './helpers.js';
 
+const it = createResolverParityIt('csharp');
+
 // ---------------------------------------------------------------------------
 // Heritage: class + interface resolution via base_list
 // ---------------------------------------------------------------------------
diff --git a/gitnexus/test/integration/resolvers/helpers.ts b/gitnexus/test/integration/resolvers/helpers.ts
index 4e394c0f0c..710fcddeb1 100644
--- a/gitnexus/test/integration/resolvers/helpers.ts
+++ b/gitnexus/test/integration/resolvers/helpers.ts
@@ -2,10 +2,54 @@
  * Shared test helpers for language resolution integration tests.
  */
 import path from 'path';
+import { it as vitestIt } from 'vitest';
 import { runPipelineFromRepo } from '../../../src/core/ingestion/pipeline.js';
 import type { PipelineOptions } from '../../../src/core/ingestion/pipeline.js';
 import type { PipelineResult } from '../../../src/types/pipeline.js';
-import type { GraphRelationship } from '../../../src/core/graph/types.js';
+import type { GraphRelationship } from 'gitnexus-shared';
+
+const LEGACY_RESOLVER_PARITY_EXPECTED_FAILURES: Readonly<Record<string, ReadonlySet<string>>> = {
+  csharp: new Set([
+    'emits the using-import edge App/Program.cs -> Models/User.cs through the scope-resolution path',
+  ]),
+};
+
+type ResolverParityEnv = Readonly<Record<string, string | undefined>>;
+type VitestIt = typeof vitestIt;
+type CallableIt = (name: string, ...args: unknown[]) => unknown;
+
+export function resolverParityFlagName(languageSlug: string): string {
+  return `REGISTRY_PRIMARY_${languageSlug.toUpperCase().replace(/-/g, '_')}`;
+}
+
+export function isLegacyResolverParityRun(
+  languageSlug: string,
+  env: ResolverParityEnv = process.env,
+): boolean {
+  const value = env[resolverParityFlagName(languageSlug)]?.trim().toLowerCase();
+  return value === '0' || value === 'false' || value === 'no';
+}
+
+export function isLegacyResolverParityExpectedFailure(
+  languageSlug: string,
+  testName: string,
+  env: ResolverParityEnv = process.env,
+): boolean {
+  if (!isLegacyResolverParityRun(languageSlug, env)) return false;
+  return LEGACY_RESOLVER_PARITY_EXPECTED_FAILURES[languageSlug]?.has(testName) ?? false;
+}
+
+export function createResolverParityIt(languageSlug: string): VitestIt {
+  const wrapped = ((name: string, ...args: unknown[]) => {
+    const runner = isLegacyResolverParityExpectedFailure(languageSlug, name)
+      ? vitestIt.skip
+      : vitestIt;
+    return (runner as unknown as CallableIt)(name, ...args);
+  }) as VitestIt;
+
+  Object.assign(wrapped, vitestIt);
+  return wrapped;
+}
 
 export const FIXTURES = path.resolve(__dirname, '..', '..', 'fixtures', 'lang-resolution');
 export const CROSS_FILE_FIXTURES = path.resolve(
diff --git a/gitnexus/test/unit/scope-resolution/resolver-parity-expected-failures.test.ts b/gitnexus/test/unit/scope-resolution/resolver-parity-expected-failures.test.ts
new file mode 100644
index 0000000000..eae68e09d9
--- /dev/null
+++ b/gitnexus/test/unit/scope-resolution/resolver-parity-expected-failures.test.ts
@@ -0,0 +1,47 @@
+import { describe, expect, it } from 'vitest';
+import {
+  isLegacyResolverParityExpectedFailure,
+  isLegacyResolverParityRun,
+  resolverParityFlagName,
+} from '../../integration/resolvers/helpers.js';
+
+const csharpNamespaceRootImportTest =
+  'emits the using-import edge App/Program.cs -> Models/User.cs through the scope-resolution path';
+
+describe('resolver parity expected legacy failures', () => {
+  it('uses the same env var convention as the parity workflow', () => {
+    expect(resolverParityFlagName('csharp')).toBe('REGISTRY_PRIMARY_CSHARP');
+    expect(resolverParityFlagName('c-plus-plus')).toBe('REGISTRY_PRIMARY_C_PLUS_PLUS');
+  });
+
+  it('recognizes only legacy parity runs', () => {
+    expect(isLegacyResolverParityRun('csharp', { REGISTRY_PRIMARY_CSHARP: '0' })).toBe(true);
+    expect(isLegacyResolverParityRun('csharp', { REGISTRY_PRIMARY_CSHARP: 'false' })).toBe(true);
+    expect(isLegacyResolverParityRun('csharp', { REGISTRY_PRIMARY_CSHARP: '1' })).toBe(false);
+    expect(isLegacyResolverParityRun('csharp', {})).toBe(false);
+  });
+
+  it('matches configured expected failures only during the legacy run', () => {
+    expect(
+      isLegacyResolverParityExpectedFailure('csharp', csharpNamespaceRootImportTest, {
+        REGISTRY_PRIMARY_CSHARP: '0',
+      }),
+    ).toBe(true);
+
+    expect(
+      isLegacyResolverParityExpectedFailure('csharp', csharpNamespaceRootImportTest, {
+        REGISTRY_PRIMARY_CSHARP: '1',
+      }),
+    ).toBe(false);
+
+    expect(
+      isLegacyResolverParityExpectedFailure(
+        'csharp',
+        'detects exactly 3 classes and 2 interfaces',
+        {
+          REGISTRY_PRIMARY_CSHARP: '0',
+        },
+      ),
+    ).toBe(false);
+  });
+});