Reverse grammar tables into pattern matchers. 3-tier lookup:
JSON grammar data → irregular verb maps → regular morphology rules.
Verified by round-tripping through forward functions.
Export IrregularVerbs() and IrregularNouns() so the reversal engine
reads from the authoritative source instead of a duplicate list.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>