giles 4534fb9fee Add bootstrap_py.py: transpile SX spec to Python evaluator ...

Mirrors bootstrap_js.py pattern — reads the .sx reference spec files
(eval.sx, render.sx, adapter-html.sx) and emits a standalone Python
evaluator module (sx_ref.py) that can be compared against the
hand-written evaluator.py / html.py.

Key transpilation techniques:
- Nested IIFE lambdas for let bindings: (lambda a: body)(val)
- _sx_case helper for case/type dispatch
- Short-circuit and/or via Python ternaries
- Functions with set! emitted as def with _cells dict for mutation
- for-each with inline fn emitted as Python for loops
- Statement-level cond emitted as if/elif/else chains

Passes 27/27 comparison tests against hand-written evaluator.

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

2026-03-05 19:32:01 +00:00

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