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POST /api/briefing/articles/<id>/discuss injects stored article content as a persisted read_article tool exchange before triggering generation. The LLM sees the article as already read; follow-ups retain context via the fixed history builder. Frontend Discuss button now calls the new endpoint instead of inlining article text in the user message. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>