Misc fixes

[cs01]

misc-fixes

Summary

Miscellaneous compiler improvements: fix FunctionNode field ordering for native compiler stability, add type alias global variable support, simplify union-type-checker, and sync c.json() type signature.

Changes

• Fix typeParameters field order in FunctionNode — Moved typeParameters to the end of the interface and all creation sites (parser-ts, parser-native). Required for native compiler struct layout correctness: fields after any undefined-valued boolean can shift GEP indices.

• Type alias global variable support — Global const/let declarations typed with a type alias (e.g. const config: Config) now resolve the alias to its LLVM type instead of falling through to expression-based detection.

• Sync c.json() type signature — lib/router.ts already accepted any since Router and JSON auto-serialization fixes #82, but chadscript.d.ts still declared json(data: string). Updated to json(data: any).

• Simplify union-type-checker — Converted from class to standalone functions. No behavioral change.

Testing

All existing tests pass.