- Add distance-based get_at on EnvironmentStack
- Add distance-based assign_at on EnvironmentStack
- Introduce ErrorSink to accumulate diagnostics across passes
- Implement Resolver with a ScopeStack and per-node distance map
- Extend interpreter to store locals distances for runtime lookup
- Add tests for resolution behavior and error accumulation
Add static variable resolution with scope tracking
- Introduce AST-based visitor and resolver in middleend
- Update guard field and parser to use AstNode<Expr>
- Remove backend variable_resolution and adjust exports
- Expose middleend in the library
Giulio Agostini