moonbitlang / core / 4135

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refactor(builtin): declarative reverse-range loop in FixedArray::rev_foldi

Replace `for i = len-1, acc = init; i >= 0; { continue i-1, ... }`
with `for i in len>..0; acc = init { continue ... }`.

Semantics-preserving: `moon test -p builtin` (2825/2825) passes and
`moon info` produces no `.mbti` change.

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

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