Giulio Agostini
827349cbad
The commit rewrites the environment to use a stack of hash maps for managing variable scopes. This replaces the old parent-reference approach with a simpler and more efficient stack-based model. Key changes: - Rename Environment to EnvironmentStack - Store scopes in a Vec of HashMaps - Add push/pop scope operations for block handling - Update interpreter to properly manage scope lifetimes - Clean up error handling with helper functions