fix(sdk): enforce runtime dependency boundary

cocoscreator_projects/framework-tests/architecture/import-boundaries.test.mjs

@@ -187,6 +187,36 @@ test('scanner rejects sdk contracts importing a framework platform path', async
   assert.match(scan(root)[0].message, /sdk.*platform/);
 });
 
+test('scanner rejects every sdk runtime dependency on framework implementation layers', async () => {
+  const layers = [
+    'core',
+    'platform',
+    'net',
+    'config',
+    'native',
+    'protocol',
+    'application',
+    'domain',
+    'presentation',
+    'ui',
+    'compat',
+  ];
+
+  for (const layer of layers) {
+    const root = await createFixtureRoot();
+    await writeFixture(root, `framework/${layer}/internal.ts`, 'export const value = true\n');
+    await writeFixture(
+      root,
+      'framework/sdk/runtime/bad.ts',
+      `import { value } from '../../${layer}/internal.ts'; void value\n`,
+    );
+
+    const violations = scan(root);
+    assert.equal(violations.length, 1, layer);
+    assert.match(violations[0].message, /sdk.*framework implementation/, layer);
+  }
+});
+
 test('scanner rejects game imports of framework net internals', async () => {
   const root = await createFixtureRoot();
   await writeFixture(root, 'games/a/assets/game/bad.ts', "import '../../../framework/net/net-client.ts'\n");