fix: make stdout UTF-8 for Windows runners

Emoji and check marks (✔ ✖ ❌) cannot be encoded by the default cp1252
codec on Windows, crashing the action. Reconfigure stdout/stderr to
UTF-8, matching commit-check core's _reconfigure_io.

Author: shenxianpeng

main.py

@@ -40,6 +40,14 @@ def env_flag(name: str, default: str = "false") -> bool:
     return os.getenv(name, default).lower() == "true"
 
 
+def _reconfigure_io() -> None:
+    """Reconfigure stdout/stderr to UTF-8 so emoji and check marks never
+    crash on runners with legacy encodings (e.g. cp1252 on Windows)."""
+    for stream in (sys.stdout, sys.stderr):
+        if hasattr(stream, "reconfigure"):
+            stream.reconfigure(encoding="utf-8", errors="replace")
+
+
 MESSAGE_ENABLED = env_flag("MESSAGE")
 BRANCH_ENABLED = env_flag("BRANCH")
 AUTHOR_NAME_ENABLED = env_flag("AUTHOR_NAME")
@@ -646,6 +654,7 @@ def log_error_and_exit(ret_code: int, results: list[ScopeResult]) -> None:
 
 def main():
     """Main function to run commit-check and render all output surfaces."""
+    _reconfigure_io()
     log_env_vars()
 
     ret_code, results = run_commit_check()

main_test.py

@@ -81,6 +81,40 @@ def test_missing_uses_default(self):
             self.assertTrue(main.env_flag("FEATURE_FLAG", default="true"))
 
 
+class TestReconfigureIo(unittest.TestCase):
+    def test_reconfigures_streams_to_utf8(self):
+        class FakeStream:
+            def __init__(self):
+                self.reconfigured = None
+
+            def reconfigure(self, **kwargs):
+                self.reconfigured = kwargs
+
+        fake_out = FakeStream()
+        fake_err = FakeStream()
+        with (
+            patch.object(sys, "stdout", fake_out),
+            patch.object(sys, "stderr", fake_err),
+        ):
+            main._reconfigure_io()
+        self.assertEqual(
+            fake_out.reconfigured, {"encoding": "utf-8", "errors": "replace"}
+        )
+        self.assertEqual(
+            fake_err.reconfigured, {"encoding": "utf-8", "errors": "replace"}
+        )
+
+    def test_streams_without_reconfigure_are_ignored(self):
+        class NoopStream:
+            pass
+
+        with (
+            patch.object(sys, "stdout", NoopStream()),
+            patch.object(sys, "stderr", NoopStream()),
+        ):
+            main._reconfigure_io()  # should not raise
+
+
 class TestBuildCheckArgs(unittest.TestCase):
     def test_all_true(self):
         with (