test: verify branch deletion ref update #60

Closed nnabeyang.tngl.sh
targeting main from validation/delete-branch-ref-update-20260730
Closed opened by and assigned to nnabeyang.tngl.sh
targeting main from validation/delete-branch-ref-update-20260730

Temporary tng-playground pull request for validating that deleting the source branch emits a ref update and removes the branch from indexed reads. This pull request will be closed without merging.

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