Language specification sources moved to dmd repository

[Mindy (0xEAB)]

On Sunday, 15 March 2026 at 18:27:39 UTC, Dennis wrote:
> […] and Atila even expressed desire to also move Phobos into 
> the dmd repository, but there's no plan for that yet.

While I agree with this change in principle, I currently see a 
major increase in overhead for Phobos developers by merging the 
issue tracker and PR list with DMD’s and Druntime’s.