feat: derive enum #41
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Implement struct-of-arrays transformation for enums with discriminant-based storage. Enums are decomposed into a separate discriminant array and union arrays for each field position. Features: - Generate discriminant-only enum with preserved explicit values - Create union types for each field position across variants - Support named and unnamed variant fields - Support unit variants and explicit discriminant expressions - Preserve enum visibility (pub, pub(crate), private) Safety: - Discriminant fields kept private in helper structs - Safe get_discriminant() accessor methods - Unsafe get_discriminant_mut() requires caller to maintain invariants - Prevents unsound discriminant/union field mismatches Tests added for discriminant access, named fields, and visibility.
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