New endpoints: /antonyms, /backing, /pronunciation, /etymology with difficulty scoring on /random. Cross-language synset backing links French/Portuguese words to English equivalents via WordNet 3.0 synset IDs (matching WOLF and OMW offsets). New loaders: Hunspell affix expansion (fr, pt-PT), English programmatic inflector, CMU Pronouncing Dictionary, SUBTLEX-US frequency, CETEMPúblico frequency, Open Multilingual Wordnet (Portuguese), and SQL-based difficulty scoring. Schema v2 adds tables: antonyms, synsets, word_synsets, pronunciations, etymology with migration support for existing databases. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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