Git blame fails from a worktree

[fasterthanlime]

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Describe the bug / provide steps to reproduce it

This happens when the "inline git blame" feature triggers. From the main repo, it works fine.

Environment

Zed: v0.159.1 (Zed Preview)
OS: macOS 15.0.1
Memory: 8 GiB
Architecture: aarch64

If applicable, add mockups / screenshots to help explain present your vision of the feature

No response

If applicable, attach your Zed.log file to this issue.

Zed.log

[fasterthanlime]

You can repro with something like:

mkdir ~/gh-19842
cd ~/gh-19842
git clone https://github.com/fasterthanlime/hi
cd hi
git worktree add ../hi-worktree 6341517

Then open zed in ~/gh-19842/hi-worktree, open any file, notice the notif that tells you it cannot git blame.

Notably, the .git/ folder in a worktree is... a file:

hi on  main [+] is 📦 v0.3.0 via 🦀 v1.81.0
❯ cat .git
cat: .git: Is a directory

hi on  main [+] is 📦 v0.3.0 via 🦀 v1.81.0
❯ cat ../hi-worktree/.git
gitdir: /Users/amos/axo/hi/.git/worktrees/hi-worktree

(When you're done, don't forget to git worktree remove ../hi-worktree — this needs to be run from within hi)