moonbitlang / core / 4162

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refactor(argparse): set comprehension in collect_non_global_names

Replace the iter chain with a direct array-comprehension fed to `Set::Set`:

```diff
-  @set.from_iter(args.iter().filter(arg => !arg.global).map(arg => arg.name))
+  Set([for arg in args if !arg.global => arg.name])
```

argparse is a non-hot path; the small bounded intermediate array (one
String per non-global arg, typically <20) is acceptable.

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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