Module context 

Global context: owns all arenas and provides the central data store for the entire parse → codegen pipeline.

The GlobalContext is created once, mutated during parsing (Phase 1+2), then borrowed immutably for codegen.

Structs

GlobalContext

The global data store shared across parsing and codegen.

ModuleId

Well-typed index into the module registry.

ParsedModule

A parsed source file / module.

TypeId

Well-typed index into the type arena.