fix(signal): register C-; M prefix via canonical helper

The C-; M Signal prefix didn't take effect on a fresh Emacs launch. signal-config.el was the only feature module that bound into cj/custom-keymap directly, wrapped in (with-eval-after-load 'keybindings (when (boundp 'cj/custom-keymap) ...)). The boundp guard turned a load-order miss into a silent no-op, so the binding never landed at startup. A later live-reload always papered over it because keybindings was loaded by then.

I switched to the documented cj/register-prefix-map helper and added (require 'keybindings) at the top, matching every other prefix map. The require guarantees keybindings loads before registration, so the guard is gone.

I verified at a full emacs --batch init.el launch, the actual failing scenario, that C-; M resolves to the signel prefix. I added a contract test asserting the registration, since the boundp guard was robust under unit timings and only failed at full launch.

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