fix(auth): close shared-context isolation edge cases

tests/unit/auth-list-context.test.ts

@@ -85,4 +85,78 @@ describe('auth list context metadata', () => {
     expect(work?.context_mode).toBe('shared');
     expect(work?.context_group).toBe('sprint-a');
   });
+
+  it('prefers unified context metadata over legacy when profile names overlap', async () => {
+    const ccsDir = path.join(tempRoot, '.ccs');
+    fs.mkdirSync(ccsDir, { recursive: true });
+
+    fs.writeFileSync(
+      path.join(ccsDir, 'profiles.json'),
+      JSON.stringify(
+        {
+          version: '2.0.0',
+          profiles: {
+            work: {
+              type: 'account',
+              created: '2026-01-01T00:00:00.000Z',
+              last_used: null,
+              context_mode: 'isolated',
+            },
+          },
+          default: null,
+        },
+        null,
+        2
+      )
+    );
+
+    fs.writeFileSync(
+      path.join(ccsDir, 'config.yaml'),
+      [
+        'version: 8',
+        'accounts:',
+        '  work:',
+        '    created: "2026-02-01T00:00:00.000Z"',
+        '    last_used: null',
+        '    context_mode: shared',
+        '    context_group: sprint-a',
+        'profiles: {}',
+        'cliproxy:',
+        '  oauth_accounts: {}',
+        '  providers: {}',
+        '  variants: {}',
+      ].join('\n'),
+      'utf8'
+    );
+
+    const registry = new ProfileRegistry();
+    const instanceMgr = new InstanceManager();
+    const lines: string[] = [];
+    const originalLog = console.log;
+    console.log = (...args: unknown[]) => {
+      lines.push(args.map(String).join(' '));
+    };
+
+    try {
+      await handleList(
+        {
+          registry,
+          instanceMgr,
+          version: 'test',
+        },
+        ['--json']
+      );
+    } finally {
+      console.log = originalLog;
+    }
+
+    const payload = JSON.parse(lines.join('\n')) as {
+      profiles: Array<{ name: string; context_mode?: string; context_group?: string | null }>;
+    };
+    const work = payload.profiles.find((profile) => profile.name === 'work');
+
+    expect(work).toBeTruthy();
+    expect(work?.context_mode).toBe('shared');
+    expect(work?.context_group).toBe('sprint-a');
+  });
 });