M.V. Hutz 7318c0dac4 refactor: make lambda expression types immutable ...

- Change Abstraction, Application, and Variable to use private fields with getter methods
- Return value types instead of pointers from constructors
- Update all type switches to match value types instead of pointer types
- Remove pointer equality optimizations (not applicable with immutable values)
- Return empty set instead of nil from GetFreeVariables default case

2026-01-17 16:29:24 -05:00

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