fix(cron): preserve POSIX script decoding defaults

cron/scheduler.py

@@ -2197,15 +2197,19 @@ def _run_job_script(script_path: str) -> tuple[bool, str]:
     try:
         from tools.environments.local import _sanitize_subprocess_env
 
-        popen_kwargs = {"creationflags": windows_hide_flags()} if sys.platform == "win32" else {}
+        popen_kwargs = {}
+        if sys.platform == "win32":
+            popen_kwargs = {
+                "creationflags": windows_hide_flags(),
+                "encoding": "utf-8",
+                "errors": "replace",
+            }
         env = _sanitize_subprocess_env(os.environ.copy())
         env.update(env_overlay)
         result = subprocess.run(
             argv,
             capture_output=True,
             text=True,
-            encoding="utf-8",
-            errors="replace",
             timeout=script_timeout,
             cwd=str(path.parent),
             env=env,

tests/cron/test_cron_script.py

@@ -249,6 +249,33 @@ class TestRunJobScript:
         assert captured["kwargs"]["encoding"] == "utf-8"
         assert captured["kwargs"]["errors"] == "replace"
 
+    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
+
+        script = cron_env / "scripts" / "probe.py"
+        script.write_text('print("ok")\n')
+
+        captured = {}
+
+        def fake_run(argv, **kwargs):
+            captured["argv"] = argv
+            captured["kwargs"] = kwargs
+            return SimpleNamespace(returncode=0, stdout="ok\n", stderr="")
+
+        monkeypatch.setattr(sched_mod.sys, "platform", "linux")
+        monkeypatch.setattr(sched_mod.subprocess, "run", fake_run)
+
+        success, output = _run_job_script("probe.py")
+
+        assert success is True
+        assert output == "ok"
+        assert captured["argv"] == [sys.executable, str(script.resolve())]
+        assert captured["kwargs"]["text"] is True
+        assert "creationflags" not in captured["kwargs"]
+        assert "encoding" not in captured["kwargs"]
+        assert "errors" not in captured["kwargs"]
+
     def test_script_empty_output(self, cron_env):
         from cron.scheduler import _run_job_script