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Strategic pivot: Studio-v2 becomes a language learning platform. Compliance guardrail added to CLAUDE.md — no scan/OCR of third-party content in customer frontend. Upload of OWN materials remains allowed. Phase 1.1 — vocabulary_db.py: PostgreSQL model for 160k+ words with english, german, IPA, syllables, examples, images, audio, difficulty, tags, translations (multilingual). Trigram search index. Phase 1.2 — vocabulary_api.py: Search, browse, filters, bulk import, learning unit creation from word selection. Creates QA items with enhanced fields (IPA, syllables, image, audio) for flashcards. Phase 1.3 — /vocabulary page: Search bar with POS/difficulty filters, word cards with audio buttons, unit builder sidebar. Teacher selects words → creates learning unit → redirects to flashcards. Sidebar: Added "Woerterbuch" (/vocabulary) and "Lernmodule" (/learn). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>