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ci: automate branch tagging on MR pipelines

cbaker requested to merge feat/auto-tagging into main

Add a tag_branch job (new tag stage) that creates and pushes a lightweight git tag matching the source branch name at the end of every successful merge request pipeline. This automates the manual process described in CONTRIBUTING.md § "Tagging deleted branches", preserving CHANGELOG.md comparison links after branches are deleted on squash merge.

Includes a staleness guard: if a newer commit has been pushed while the pipeline was running, the job exits cleanly rather than overwriting the tag with a stale commit SHA.

Update CONTRIBUTING.md to document the automation and the prerequisite GitLab token access setting (Settings → CI/CD → Token Access).

Edited by cbaker

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