Extract Import Resolution Module

[0xGeorgii]

Location: core/type-checker/src/type_checker.rs (1899 lines)
Issue: The file approaches the threshold where extraction of logical subsystems should be considered. It handles conceptually distinct phases:

• Directive processing
• Type registration
• Import resolution
• Function collection
• Expression inference

Better: Extract import resolution subsystem into a separate imports.rs module:

• process_directives()
• resolve_imports()
• resolve_glob_import()
• Related helper methods