* Fix zsh ZDOTDIR wrapper + log parsing with -- messages
* Fix CI race condition: serialize self-hosted builds with concurrency group
Two workflows racing on the same self-hosted runner caused DerivedData
corruption (release's rm -rf nuked DerivedData while CI was building).
Add shared concurrency group and scope DerivedData cleanup to project.
Add a step to remove stale GhosttyTabs DerivedData before building
to prevent the "cannot open constant extraction protocol list input
file" error that occurs with incremental builds on self-hosted runners.
