Worktree names now support /-separated path segments (e.g., feature/my-branch). Each segment is independently validated for allowed characters (letters, digits, dots, underscores, dashes). The 64-character maximum length still applies to the full name.
Evidence
Path segment validation (search for "each \"/\"-separated segment must be non-empty")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
