chore(rebase): realign duplicate backend/channel/schema files with main

src/backends/external.test.ts

@@ -15,19 +15,6 @@ vi.mock('child_process', () => ({
 
 const mockExecFile = vi.mocked(execFile);
 
-function makeFailChild(stderrText = 'failed'): FakeChild {
-  const child = new EventEmitter() as FakeChild;
-  child.stdout = new EventEmitter();
-  child.stderr = new EventEmitter();
-  child.stdin = { end: vi.fn() };
-  child.kill = vi.fn();
-  setImmediate(() => {
-    child.stderr.emit('data', Buffer.from(stderrText));
-    child.emit('close', 1);
-  });
-  return child;
-}
-
 describe('ExternalCliBackend', () => {
   beforeEach(() => {
     vi.clearAllMocks();
@@ -117,25 +104,4 @@ describe('ExternalCliBackend', () => {
     expect(opencode.name).toBe('opencode');
     expect(gemini.name).toBe('gemini');
   });
-
-  it('retries failed backend calls when retries are configured', async () => {
-    spawnMock
-      .mockImplementationOnce(() => makeFailChild('transient'))
-      .mockImplementationOnce(() => makeChild('recovered'));
-    const backend = new ExternalCliBackend({
-      name: 'codex',
-      command: 'codex',
-      retries: 1,
-      retryDelayMs: 0,
-    });
-
-    const result = await backend.process({
-      systemPrompt: 'sys',
-      history: [],
-      message: 'retry me',
-    });
-
-    expect(result).toBe('recovered');
-    expect(spawnMock).toHaveBeenCalledTimes(2);
-  });
 });