- Restore real ZDOTDIR early in zsh startup so HISTFILE uses user history\n- Preserve user ZDOTDIR without treating Ghostty injected ZDOTDIR as user\n- Add regression tests and terminfo overlay for bright colors
* 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.