Clean up temporary files and update .gitignore

Co-authored-by: yhirose <357397+yhirose@users.noreply.github.com>

Author: Copilot

.gitignore

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