giles e8a991834b Add sexp.js: client-side s-expression parser, evaluator, and DOM renderer ...

Vanilla JS (no build tools) counterpart to shared/sexp/ Python modules.
Parses s-expression text, evaluates special forms, and renders to DOM
nodes or HTML strings. Full component system with defcomp/~name.

Includes:
- Parser: tokenizer + parse/parseAll matching Python parser exactly
- Evaluator: all special forms (if, when, cond, let, and, or, lambda,
  defcomp, define, ->, set!), higher-order forms (map, filter, reduce)
- DOM renderer: createElement for HTML tags, SVG namespace support,
  component invocation, raw! for pre-rendered HTML, <> fragments
- String renderer: matches Python html.render output for SSR parity
- ~50 built-in primitives (arithmetic, string, collection, predicates)
- 35 parity tests verifying JS output matches Python output via Node.js

Also fixes Python raw! handler to properly unwrap _RawHTML objects.

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

2026-02-28 23:28:21 +00:00

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