fix(undead-buffers): drop cj/save-some-buffers name collision

Emacs crashed at launch with wrong-number-of-arguments on cj/save-some-buffers, down the startup path (dashboard-only to kill-all-other-buffers to save). Two modules defined a function by that name: custom-buffer-file.el's legible save prompt (arg + pred), installed as an override on save-some-buffers, and undead-buffers.el's older one-arg wrapper that called save-some-buffers internally. custom-buffer-file loads first, undead-buffers second. The one-arg version won the shared symbol, so the override re-entered it with two args.

I removed undead-buffers.el's wrapper. cj/kill-all-other-buffers-and-windows now calls the standard save-some-buffers with the undead predicate, which routes through the override when loaded and the built-in otherwise, so undead-buffers no longer depends on custom-buffer-file. The legible override keeps the cj/save-some-buffers name.

A regression test loads both modules in launch order and guards the call and the arity so a one-arg shadow can't return.

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