Commit Briefs
use get_worktree_paths_from_argv consistently; improves add/rm edge cases
Double 'got rm' becomes a no-op like double 'got add' already is, and 'got add' of an already staged file is now an error.
Double 'got rm' becomes a no-op like double 'got add' already is, and 'got add' of an already staged file is now an error.