feat(keybindings): add cj/custom-keymap registration API

Phase 3 of the load-graph project. cj/register-prefix-map and cj/register-command bind a prefix map or command under the C-; prefix and register the which-key label once which-key loads. Feature modules will route their registration through these instead of mutating cj/custom-keymap directly, so keybindings.el stays the sole owner of the prefix and modules stop assuming the keymap already exists at load.

Adds test-init-keymap-registration.el covering prefix-map and command resolution, the optional label, and invalid-key rejection. No modules are migrated yet; that follows in batches.

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