Brandon Lucas a5762d0397 feat: add built-in Map type with String keys ...

Add Map<String, V> as a first-class built-in type for key-value storage,
needed for self-hosting the compiler (parser/typechecker/interpreter all
rely heavily on hashmaps).

- types.rs: Type::Map(K,V) variant, all match arms (unify, apply, etc.)
- interpreter.rs: Value::Map, 12 BuiltinFn variants (new/set/get/contains/
  remove/keys/values/size/isEmpty/fromList/toList/merge), immutable semantics
- typechecker.rs: Map<K,V> resolution in resolve_type
- js_backend.rs: Map as JS Map with emit_map_operation()
- c_backend.rs: LuxMap struct (linear-scan), runtime fns, emit_map_operation()
- main.rs: 12 tests covering all Map operations
- validate.sh: now checks all projects/ directories too

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-19 01:45:13 -05:00

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