fix: keep C-; ! as system command prefix

The module was binding `cj/system-command-map` under `C-; !`, then a few lines later overwriting the same prefix with `cj/system-command-menu`. The second bind won, so every documented subkey, like `C-; ! r` for reboot and `C-; ! l` for lock, was unreachable.

I kept the prefix map and folded the completing-read menu into it at `C-; ! !`. So `C-; !` still opens the prefix, the menu is one extra `!` away, and the single-letter shortcuts work again. I also added which-key labels for every documented subkey so the popup actually says what each one does.

I added `tests/test-system-commands-keymap.el`. It asserts the prefix stays mounted and that every binding (`!`, `L`, `r`, `s`, `S`, `l`, `E`, `e`) resolves to the right command.

0 files changed, 0 insertions, 0 deletions