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feat(builtin): add ReadOnlyArray::strip_prefix and strip_suffix

ReadOnlyArray already exposes starts_with and ends_with (which return
Bool), but lacked the slicing complements strip_prefix and strip_suffix
that both Array and ArrayView provide. Add them, delegating through
the matching ArrayView methods via `self[:]`. The returned ArrayView
shares the backing storage — no allocation.

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

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