Add doc: why PL/Ruby embeds CRuby (MRI), not mruby#6
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Records the rationale for linking full CRuby via libruby rather than mruby: history (PL/Ruby predates mruby by a decade), MRI C API lock-in, and the concrete capabilities that would be lost (full stdlib via require, BigDecimal lossless numerics, the Encoding framework, runtime metaprogramming). Notes the one point in mruby's favor (isolated, re-entrant mrb_state vs. MRI's process-global VM) and links it from the README documentation list. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds
doc/why-not-mruby.mddocumenting why PL/Ruby links full CRuby (MRI) vialibrubyrather than embedding mruby, and links it from the README documentation list.What it covers
require,BigDecimallossless numerics (jsonb_plruby), theEncodingframework (ltree_plruby/jsonb_plruby), and runtime metaprogramming viarb_eval_string_protect.VALUE,rb_funcall,rb_protect, …) vs. mruby'smrb_state/mrb_value.mrb_statevs. MRI's process-global VM.Docs-only change; no code or behavior affected.
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