Bijective byte-to-AST mapping tables (256 entries each for statements
and expressions). Iterative encoder, decoder, and custom codegen
prevent stack overflow on large messages. Pools scraped from real
minified codebases (React, Vue, Lodash, Three.js).

Includes CLI (encode/decode/test), 26 tests with fuzz coverage.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>