fix(tui v2): stop tool subprocesses inheriting TTY stdin (multi-session key-eating on macOS/Linux)

frontends/tuiapp_v2.py

@@ -1461,7 +1461,8 @@ def _sweep_stale_task_dirs() -> None:
 
 def _clipboard_run(cmd: list[str], input: bytes | None = None, timeout: float = 3.0) -> bytes | None:
     try:
-        r = subprocess.run(cmd, input=input, capture_output=True, timeout=timeout)
+        stdin = subprocess.DEVNULL if input is None else None
+        r = subprocess.run(cmd, input=input, stdin=stdin, capture_output=True, timeout=timeout)
         return r.stdout if r.returncode == 0 else None
     except (FileNotFoundError, subprocess.TimeoutExpired, OSError):
         return None
@@ -5913,7 +5914,7 @@ def _run_shell(self, cmd: str) -> None:
         out = ''; rc = 0
         try:
             r = subprocess.run(
-                shell_argv + [cmd], capture_output=True,
+                shell_argv + [cmd], stdin=subprocess.DEVNULL, capture_output=True,
                 timeout=30, encoding='utf-8', errors='replace',
             )
             out = (r.stdout or '') + (r.stderr or '')

ga.py

@@ -56,7 +56,8 @@ def stream_reader(proc, logs):
 
     try:
         process = subprocess.Popen(
-            cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
+            cmd, stdin=subprocess.DEVNULL,
+            stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
             bufsize=0, cwd=cwd, startupinfo=startupinfo,
             creationflags=0x08000000 if os.name == 'nt' else 0
         )

memory/checklist_helper.py

@@ -4,7 +4,7 @@
 _R = Path(__file__).resolve().parent.parent
 _BBS, _MAIN = _R/"assets/agent_bbs.py", _R/"agentmain.py"
 _W_RE, _M_RE = _R/"reflect/agent_team_worker.py", _R/"reflect/checklist_master.py"
-_PK = {"stdout": subprocess.DEVNULL, "stderr": subprocess.DEVNULL}
+_PK = {"stdin": subprocess.DEVNULL, "stdout": subprocess.DEVNULL, "stderr": subprocess.DEVNULL}
 if sys.platform == "win32": _PK["creationflags"] = 0x200
 
 class CL: