Complete the Git commands: Git Multiple Worktrees

Create a repository with one initial commit. Then create (1) a linked worktree on a new branch named `feature-a`, (2) another linked worktree on a new branch named `feature-b`, and (3) a detached worktree at the initial commit. Use `git worktree list --porcelain` to verify all worktrees. Finally, make a distinct uncommitted edit in each linked worktree and confirm that each directory has its own working-tree state. Success criteria: the main worktree and all three linked worktrees appear in the listing; feature-a and feature-b are named branches; the experiment worktree is detached; and an edit made in one worktree does not silently appear as an uncommitted edit in another worktree.