fix(finish): cd to main repo before worktree removal

[JasonOA888]

Summary

Fixes #238

Problem

The /finish workflow's Step 5 runs git worktree remove <path> without first changing the working directory. When the current shell session is inside the worktree being removed, this fails:

fatal: cannot remove worktree '<path>': '<path>' is the current working directory

This is a common scenario when Claude Code's shell is still inside the feature worktree.

Solution

Before running git worktree remove, change directory to the main repository:

# Get main repo path (first entry in worktree list is always main)
main_repo=$(git worktree list | head -1 | awk '{print $1}')

# Change to main repo before removal
cd "$main_repo"

# Now safe to remove
git worktree remove <worktree-path>

Testing

• Verified that git worktree list | head -1 | awk '{print $1}' correctly returns the main repo path
• Removal succeeds after cd-ing out of the worktree

Files Changed

• skills/finishing-a-development-branch/SKILL.md — Updated Step 5 with directory change

[robotsnh]

This looks fine. My only concern is what would happen if the user's repo isn't on git, but there's already a git command in that code block, so that's a problem for another PR.