fix: rename local path to wt_path — zsh PATH collision

[kuderr]

Summary

• In zsh, path is a special variable (lowercase mirror of PATH)
• local path inside a function empties PATH, causing command not found: git
• Renamed to wt_path in all three functions: wtcd, wto, wtn

Root cause

f() { local path; git --version; }  # fails: PATH is empty
f() { local wt_path; git --version; }  # works

Test plan

• Verified wtn, wtcd, wto work in zsh -l -i
• Verified wtn with auto-name and explicit name
• User confirms in Terminal.app after curl | bash

🤖 Generated with Claude Code

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