ClientEnvironment: use dotted OperationUID
Depends on c-crdtlib#110.
Add additional methods:
- tickTxn(): create a new Timestamp for next transaction
GitLab upgrade completed. Current version is 18.1.6 - https://about.gitlab.com/releases/2025/06/19/gitlab-18-1-released/
Depends on c-crdtlib#110.
Add additional methods: