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test(bytes): cover Bytes::repeat multiplication overflow

Add a panic test that triggers the overflow guard on a `len * count`
that wraps past `Int.MAX` (4 * 1_000_000_000 = 4_000_000_000), and
upgrade the existing bare `guard total / count == len` to use the same
explicit `else { abort("repeat result too large") }` form already used
by `Array::repeat`, `String::repeat`, and `StringView::repeat`. This
turns the overflow case from an opaque guard panic into a clearly
labeled abort, matching the rest of the `*::repeat` family.

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

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