refactor(text-enclose): extract shared region-or-buffer bounds helper

The append/prepend/indent/dedent *-in-region-or-buffer commands each inlined the same (if (use-region-p) (region-beginning) (point-min)) / (region-end)/(point-max) block — four copies of the "operate on the region, else the whole buffer" contract. Extracted cj/--region-or-buffer-bounds as the single source of that decision and routed all four through it. Behavior is unchanged; the public-wrapper tests still pass.

This was the "extract a shared helper that decides the target range" option from the reconcile task. The sibling custom-ordering.el helpers (cj/--arrayify, cj/--unarrayify) already document an explicit (start end) contract accurately and are region-required by design, so they needed no docstring change — each pair now has one clear, consistent contract. Tests cover the helper for the region case, the no-region whole-buffer case, and an empty buffer.

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