moonbitlang / core / 4193

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refactor(argparse): use Array::is_empty instead of length() == 0

argparse uniformly used `xs.length() == 0` while the rest of moonbitlang/core
prefers `.is_empty()` (60+ uses). Fix the style inconsistency: 9 sites
across `parser.mbt`, `parser_validate.mbt`, and `help_render.mbt`.

```diff
-if groups.length() == 0 {
+if groups.is_empty() {
```

Bundled because all sites are mechanical and reside in the same package.

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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