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refactor(argparse): declarative levenshtein loops + Array initializers

In `argparse/parser_suggest.mbt::levenshtein`:

- Replace the row-init loop `for j = 0; j <= n; { prev.push(j); curr.push(0); continue j+1 }`
  with declarative initializers:
    `let mut prev = Array::makei(n + 1, j => j)`
    `let mut curr = Array::make(n + 1, 0)`
- Replace c-style outer loop `for i = 1; i <= m; { ... continue i + 1 }`
  with `for i in 1..<(m + 1) { ... }`
- Replace c-style inner loop `for j2 = 1; j2 <= n; { ... continue j2 + 1 }`
  with `for j2 in 1..<(n + 1) { ... }`

`levenshtein` only runs when argparse needs to suggest a typo correction
for an unknown flag, on bounded candidate strings — not a hot path.

Semantics-preserving: `moon test -p argparse` (225/225) passes and
`moon info` produces no `.mbti` change.

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

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