ci: add Windows and Python 3.14 support

tests/tools/test_tool_validation.py

@@ -1,4 +1,3 @@
-import shlex
 import subprocess
 import sys
 from typing import Any
@@ -545,18 +544,16 @@ async def test_exec_always_returns_exit_code() -> None:
     assert "hello" in result
 
 
-async def test_exec_head_tail_truncation() -> None:
+async def test_exec_head_tail_truncation(tmp_path) -> None:
     """Long output should preserve both head and tail."""
     tool = ExecTool()
     # Generate output that exceeds _MAX_OUTPUT (10_000 chars)
-    # Use current interpreter (PATH may not have `python`). ExecTool uses
-    # create_subprocess_shell: POSIX needs shlex.quote; Windows uses cmd.exe
-    # rules, so list2cmdline is appropriate there.
-    script = "print('A' * 6000 + '\\n' + 'B' * 6000)"
-    if sys.platform == "win32":
-        command = subprocess.list2cmdline([sys.executable, "-c", script])
-    else:
-        command = f"{shlex.quote(sys.executable)} -c {shlex.quote(script)}"
+    # Use a temp script file to avoid Windows command line quote parsing issues
+    script_file = tmp_path / "gen_output.py"
+    script_file.write_text("print('A' * 6000 + chr(10) + 'B' * 6000)", encoding="utf-8")
+    # On Windows, cmd.exe handles quotes differently. Use the path directly
+    # without additional quotes since the temp path shouldn't have spaces.
+    command = f"{sys.executable} {script_file}"
     result = await tool.execute(command=command)
     assert "chars truncated" in result
     # Head portion should start with As