feat: add wtbye alias — remove current worktree and cd to origin

[kuderr]

Summary

• Add wtbye shell alias function that removes the current worktree and navigates back to the origin repo
• Validates you're in a git-wt managed worktree (not in origin, not external)
• Extracts worktree name from pwd, cds to origin first, then runs git wt rm

Test plan

• source aliases/git-wt.sh, create a worktree with wtn test, then run wtbye — should remove and land in origin
• Run wtbye from origin repo — should show "already in origin" error
• Run wtbye from a non-worktree directory — should show error

🤖 Generated with Claude Code

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