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feat(builtin): add ReadOnlyArray::rev_iter

Array, ArrayView, MutArrayView, and FixedArray.iter() chain (via
Iter::rev — note Iter does not have rev) — all expose `rev_iter`,
which produces an iterator from last element to first. ReadOnlyArray
already had `iter` and `iter2` but not the reverse counterpart.

Implementation delegates to ArrayView::rev_iter via `self[:]`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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