cleaning
add more in .gitignore
add a few lost examples from examples/bts
remove useless sessions in bench/ce/
GitLab upgrade completed. Current version is 18.3.6
https://about.gitlab.com/releases/2025/07/17/gitlab-18-2-released/
https://about.gitlab.com/releases/2025/08/21/gitlab-18-3-released/
add more in .gitignore
add a few lost examples from examples/bts
remove useless sessions in bench/ce/