GHSA-wvpp-8hx9-p66j: GitPython: Unsafe git option guard bypass via split_single_char_options=False short-option token smuggling enables command execution

The check_unsafe_options guard can be bypassed on every guarded method (clone/clone_from, fetch/pull/push, ls_remote, iter_commits, blame, archive) by combining a single-character kwarg with split_single_char_options=False. The guard’s candidate list omits the smuggled option, but transform_kwarg emits a JOINED -n<value> argv token that git parses as --upload-pack=<cmd>, yielding arbitrary command execution at the default allow_unsafe_options=False. This is an incomplete-fix bypass of commit e8d0fbf7 (the fix for GHSA-r9mr-m37c-5fr3), which only emits value-derived candidates when split_single_char_options is True.