feat(system-defaults): warn once when Customize tries to save

custom-file points at a throwaway temp file so Customize edits never persist — deliberate, since config lives in Elisp, but silent. A user who clicks "Save for Future Sessions" loses the edit on exit with no hint. I advise custom-save-all (the chokepoint both customize-save-variable and the Customize button funnel through) with a one-shot :before warning that explains the discard and points at the Elisp init files. The advice removes itself after firing, so it warns once per session, and the body never runs at load, so startup stays quiet.

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