externalLauncher, providerMaintenance, AntigravityInstallation, and
ResourceMonitorBinary write #!/bin/sh stubs (or chmod 0o755 files) into a
real temp dir and resolve them under a linux/darwin platform mock. On a
Windows host the temp path carries a drive letter, so the posix ':' PATH
split shatters it, and NTFS never reports the exec bits the linux branch
checks. Skip those tests there; the win32-mocked siblings already cover the
Windows branches with .cmd fixtures.

Co-Authored-By: Claude Code <noreply@anthropic.com>