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refactor(quickcheck): unwrap_or / unwrap_or_else in gen

Replace two `match opt { None => default; Some(x) => x }` blocks with
the dedicated `Option` helpers:

```diff
-  let size = match size {
-    None => 0
-    Some(x) => x
-  }
-  let state = match state {
-    None => @splitmix.RandomState::default()
-    Some(x) => x
-  }
+  let size = size.unwrap_or(0)
+  let state = state.unwrap_or_else(() => @splitmix.RandomState::default())
```

`unwrap_or_else` keeps the lazy default — `RandomState::default()` only
runs when `state` is `None`, matching the original.

Semantics-preserving: `moon test -p quickcheck` (26/26) passes and
`moon info` produces no `.mbti` change.

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

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