Clean up temporary files and update .gitignore

Co-authored-by: yhirose <[email protected]>

Author: Copilot

.gitignore

@@ -43,3 +43,9 @@ ipch
 .*
 !/.gitattributes
 !/.github
+
+# Temporary files
+*.o
+test_*
+minimal_test
+test_compile*