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Builds the implied-vol smile from the three standard FX market quotes (ATM delta-neutral straddle, 25-delta risk reversal, 25-delta butterfly) using Castagna & Mercurio's second-order Vanna-Volga approximation, and reprices each portfolio leg off the smile vs the flat vol. - backend: core/vanna_volga.py (delta->strike, DNS ATM, VV smile) and POST /api/smile - frontend: new "Vol Smile" dashboard tab with quote inputs, smile chart, pillar table and smile-vs-flat leg repricing Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FpiqUMAyo4RL5DdQHMWbwE