[FEATURE]: configurable path for worktrees

[kvokka]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Now git worktrees are created as ~/.local/share/opencode/worktree/8481/cosmic-rocket, but it makes them tricky to save with ephemeral environments, like codespaces or even plain Docker containers. As a workaround i'm creating the link for the folder to the path that is convenient to me for ~/.local/share/opencode/worktree;

But it would be great to have this path configurable either globally or, even better, with the relative path to the project.

Now I use this temporary workaround

ln -sfT ~/my/awesome/opencode_worktrees ~/.local/share/opencode/worktree

Can implement it, if u approve the idea.