fix(integration): restore stdin=DEVNULL on computer_use subprocess calls dropped in simplification

tools/computer_use/cua_backend_daemon.py

@@ -49,7 +49,8 @@ def _validate_cua_driver_app_signature(app_path: str) -> None:
     if not codesign:
         raise RuntimeError("codesign is required to verify CuaDriver.app before launching it.")
     try:
-        proc = subprocess.run([codesign, "-dv", app_path], capture_output=True, text=True, timeout=15)
+        proc = subprocess.run([codesign, "-dv", app_path], capture_output=True, text=True, timeout=15,
+                              stdin=subprocess.DEVNULL)
     except (OSError, subprocess.TimeoutExpired) as exc:
         raise RuntimeError(f"could not verify CuaDriver.app signature: {exc}") from exc
     if proc.returncode != 0:

tools/computer_use/doctor.py

@@ -44,7 +44,7 @@ class HealthReportUnavailable(RuntimeError):
 def _run_cli(binary: str, *args: str, timeout: float) -> subprocess.CompletedProcess:
     """Run ``<binary> args`` with UTF-8 capture + sanitized env (raises on failure)."""
     return subprocess.run([binary, *args], capture_output=True, text=True, encoding="utf-8",
-                          errors="replace", timeout=timeout, env=_sanitized_cua_env())
+                          errors="replace", timeout=timeout, env=_sanitized_cua_env(), stdin=subprocess.DEVNULL)
 
 def _combined_output(completed: subprocess.CompletedProcess) -> str:
     return ((completed.stdout or "") + (completed.stderr or "")).strip()