fix(core): harden env loading, OpenAI compatibility, and runtime recovery

src/frontends/tui/minimal.test.ts

@@ -49,6 +49,7 @@ function minimalTuiPrivates(value: MinimalTui): {
   };
   activePromptCancel: (() => void) | null;
   activeOperationCancel: (() => void) | null;
+  commandInFlight: boolean;
   running: boolean;
 } {
   return value as unknown as {
@@ -70,6 +71,7 @@ function minimalTuiPrivates(value: MinimalTui): {
     };
     activePromptCancel: (() => void) | null;
     activeOperationCancel: (() => void) | null;
+    commandInFlight: boolean;
     running: boolean;
   };
 }
@@ -469,6 +471,38 @@ describe('MinimalTui prompt cancellation', () => {
     expect(minimalTuiPrivates(tui).activePromptCancel).toBeNull();
   });
 
+  it('returns empty string when readline is already closed during question', async () => {
+    const mockSession = {
+      id: 'test',
+      getHistory: () => [],
+      addMessage: vi.fn(),
+      clear: vi.fn(),
+      replaceHistory: vi.fn(),
+    };
+
+    const tui = new MinimalTui({
+      session: asSession(mockSession),
+      modelClient: asRouter({}),
+      systemPrompt: 'test',
+    });
+
+    const questionError = new Error('readline was closed');
+    (questionError as Error & { code?: string }).code = 'ERR_USE_AFTER_CLOSE';
+
+    minimalTuiPrivates(tui).rl = {
+      once: vi.fn(),
+      removeListener: vi.fn(),
+      question: vi.fn(() => {
+        throw questionError;
+      }),
+      write: vi.fn(),
+      prompt: vi.fn(),
+    };
+
+    await expect(minimalTuiPrivates(tui).prompt('Confirm? ')).resolves.toBe('');
+    expect(minimalTuiPrivates(tui).activePromptCancel).toBeNull();
+  });
+
   it('uses Esc to cancel active running operation', () => {
     const mockSession = {
       id: 'test',
@@ -530,4 +564,46 @@ describe('MinimalTui prompt cancellation', () => {
       logSpy.mockRestore();
     }
   });
+
+  it('exits immediately on Ctrl+C when a command is in flight', () => {
+    const mockSession = {
+      id: 'test',
+      getHistory: () => [],
+      addMessage: vi.fn(),
+      clear: vi.fn(),
+      replaceHistory: vi.fn(),
+    };
+
+    const write = vi.fn();
+    const prompt = vi.fn();
+    const logSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+    try {
+      const tui = new MinimalTui({
+        session: asSession(mockSession),
+        modelClient: asRouter({}),
+        systemPrompt: 'test',
+      });
+      minimalTuiPrivates(tui).rl = {
+        once: vi.fn(),
+        removeListener: vi.fn(),
+        question: vi.fn(),
+        write,
+        prompt,
+      };
+      minimalTuiPrivates(tui).running = true;
+      minimalTuiPrivates(tui).commandInFlight = true;
+      const cancel = vi.fn();
+      minimalTuiPrivates(tui).activeOperationCancel = cancel;
+
+      const shouldExit = minimalTuiPrivates(tui).handleCtrlCPress(1000);
+
+      expect(shouldExit).toBe(true);
+      expect(cancel).toHaveBeenCalledOnce();
+      expect(write).not.toHaveBeenCalled();
+      expect(prompt).not.toHaveBeenCalled();
+      expect(logSpy).not.toHaveBeenCalledWith(expect.stringContaining('Press Ctrl+C again to quit'));
+    } finally {
+      logSpy.mockRestore();
+    }
+  });
 });