MEP-56 note 10: Build system

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

RubyGems gemspec with SPDX Apache-2.0 license, Bundler Gemfile.lock for reproducibility, IRuby kernel for Jupyter, Tebako 0.9+ for single-file binary, TruffleRuby native-image via GraalVM 24, mruby 4 mrbc compiler. gem push + pkg dry-run gate.

Full research note content for MEP-56 note 10.