A Mac app that lets Claude Code, Cursor and Codex work on one project without breaking each other. Each agent gets a lane: its own branch, port, database copy and address, and you decide what gets merged into main. Git worktrees only separate the code; lanes also give each agent its own port and database. Plus every project, port and version on your Mac, why a project won't start, and servers agents left running. Free plan; lanes are Pro.