Add ability to spawn worktree when creating new branch

[peterHoburg]

Add the ability for spec-kit to create a new dir with a git worktree when it creates a new branch. This will allow you to work on multiple tickets at the same time on the same machine.

[dpeckham]

It's essential to be able to work on multiple features at the same time.

[tianlinzx]

And also need an approach to manage git repos properly, currently seems the spec kit only knows creating a new branch ,but seems it doesn't merge the branch to main/master branch once it finishes the spec development.

[srobertson]

Agreed I'm desiring a similar workflow were I can work on specs from the main branch and use work trees for the actual implementatino...
I want to generate multiple specs, I often want to work on specs while the ai is coding..
The current workflow creates a branch so numbering gets wonky fast if you don't get them merged into main. My current workaround is:

• From main start a spec.. when I'm happy with /tasks output...
• Merge back into main, rebase back into the branch
• Go back to main and then setup a work-tree
  Very cumbersome..

[acomito]

This feels like the #1 item

[francovp]

For the record, Cursor 2.0 is using git worktrees for the new "Parallel agents" feature to run multiple agents locally in parallel https://cursor.com/en-US/docs/configuration/worktrees

Would be great if spec-kit support this

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