fix: normalize Windows cron shell script paths

cron/scheduler.py

@@ -2345,6 +2345,19 @@ def _windows_cron_python_invocation(python_exe: str) -> tuple[str, dict[str, str
     return str(interpreter), env_overlay
 
 
+def _cron_script_argv(path: Path) -> str:
+    """Return the best shell-script argument for cron.
+
+    Native Windows cron uses Git Bash for `.sh/.bash` scripts.  Bash expects
+    forward-slash paths (for example ``C:/Users/...``), so normalise only on
+    win32 to avoid backslash-related launch failures while preserving normal
+    POSIX behavior.
+    """
+    if sys.platform == "win32":
+        return path.as_posix()
+    return str(path)
+
+
 def _run_job_script(
     script_path: str,
     workdir: Optional[str] = None,
@@ -2440,13 +2453,12 @@ def _run_job_script(
                 f"Cannot run .sh/.bash script {path.name!r}: bash not found on PATH. "
                 "On Windows, install Git for Windows (which ships Git Bash) "
                 "or rewrite the script as Python (.py)."
-        )
-        argv = [_bash, str(path)]
+            )
+        argv = [_bash, _cron_script_argv(path)]
         env_overlay: dict[str, str] = {}
     else:
         python_exe, env_overlay = _windows_cron_python_invocation(sys.executable)
         argv = [python_exe, str(path)]
-
     try:
         from tools.environments.local import build_subprocess_env
 

tests/cron/test_cron_script.py

@@ -173,6 +173,24 @@ def fake_run(argv, **kwargs):
         assert str(site_packages) in env["PYTHONPATH"]
 
 
+    def test_windows_script_arg_normalizes_backslashes(self, monkeypatch):
+        from pathlib import PureWindowsPath
+        from cron.scheduler import _cron_script_argv
+
+        monkeypatch.setattr("cron.scheduler.sys.platform", "win32")
+
+        windows_path = PureWindowsPath(r"C:\\Users\\Example\\.hermes\\scripts\\watch.sh")
+        assert _cron_script_argv(windows_path) == "C:/Users/Example/.hermes/scripts/watch.sh"
+
+    def test_non_windows_script_arg_preserves_posix_path(self, monkeypatch):
+        from pathlib import Path
+        from cron.scheduler import _cron_script_argv
+
+        monkeypatch.setattr("cron.scheduler.sys.platform", "linux")
+
+        posix_path = Path("/Users/Example/.hermes/scripts/watch.sh")
+        assert _cron_script_argv(posix_path) == str(posix_path)
+
     def test_non_windows_script_preserves_default_text_decoding(self, cron_env, monkeypatch):
         from cron import scheduler as sched_mod
         from cron.scheduler import _run_job_script