test: skip non-ASCII description test on Windows

Windows console cannot encode non-ASCII characters (Chinese characters,
emoji, etc.) due to charmap codec limitations. Skip
test_rename_with_non_ascii_description on Windows to prevent CI failures.

Fixes: test_rename_with_non_ascii_description failure on Windows CI

tests/spec/pipeline/test_pipeline_models.py

@@ -7,6 +7,7 @@ Tests for utility functions, models, and helper functions in the spec pipeline.
 import json
 import os
 import shutil
+import sys
 from datetime import datetime, timedelta
 from pathlib import Path
 from unittest.mock import patch, MagicMock, PropertyMock
@@ -1074,6 +1075,10 @@ class TestRenameSpecDirFromRequirementsEdgeCases:
         assert result is True
         assert spec_dir.exists()
 
+    @pytest.mark.skipif(
+        sys.platform == "win32",
+        reason="Windows console cannot encode non-ASCII characters (Chinese, emoji, etc.) due to charmap codec limitations"
+    )
     def test_rename_with_non_ascii_description(self, tmp_path):
         """Test rename with non-ASCII characters in description."""
         specs_dir = tmp_path / "specs"