giles 6c87210728 spec: define-type special form — constructors, predicates, accessors (20 tests) ...

Adds sf-define-type via register-special-form! in spec/evaluator.sx.
ADT values are dicts {:_adt true :_type "T" :_ctor "C" :_fields (list ...)}.
Each define-type call registers: ctor functions with arity checking, Name?
type predicate, Ctor? constructor predicates, Ctor-field positional accessors,
and populates *adt-registry* dict with type→[ctor-names] mapping.
20/20 JS tests pass in spec/tests/test-adt.sx.

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

2026-04-26 17:56:50 +00:00

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