Guide for using gtr (git-worktree-runner), a CLI tool for managing git worktrees with editor and AI tool integration. Use this skill when the user asks about: (1) creating, managing, or removing git worktrees, (2) setting up gtr / git-gtr for a project, (3) configuring editors (Cursor, VS Code, Zed) or AI tools (Claude Code, Aider, Codex, Gemini) with worktrees, (4) running parallel development workflows across multiple branches, (5) copying config/env files to new worktrees, (6) setting up hooks for worktree creation/removal, (7) troubleshooting git worktree issues, (8) any mention of "gtr", "git gtr", "git worktree runner", or "worktree" in context of parallel dev. Triggers on keywords: gtr, git-gtr, worktree, parallel branches, multi-branch workflow.