giles 235428628a Add reference SX evaluator written in s-expressions ...

Meta-circular evaluator: the SX language specifying its own semantics.
A thin bootstrap compiler per target (JS, Python, Rust) reads these
.sx files and emits a native evaluator.

Files:
- eval.sx: Core evaluator — type dispatch, special forms, TCO trampoline,
  lambda/component/macro invocation, higher-order forms
- primitives.sx: Declarative specification of ~80 built-in pure functions
- render.sx: Three rendering modes (DOM, HTML string, SX wire format)
- parser.sx: Tokenizer, parser, and serializer specification

Platform-specific concerns (DOM ops, async I/O, HTML emission) are
declared as interfaces that each target implements.

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

2026-03-05 09:31:40 +00:00

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