MEP-56 note 07: Ruby target and portability

Author: research pass for MEP-56 (Mochi to Ruby transpiler). Date: 2026-05-29 (GMT+7).

CRuby 3.2 LTS, CRuby 3.4, CRuby 4.0 (YJIT default), JRuby 10 (Ruby 3.4 compat), TruffleRuby 33 (GraalVM 24). mruby 4 subset (no Thread, no Data.define; agents desugar to plain classes). Tebako single-file binary packaging.

Full research note content for MEP-56 note 07.