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First live fill (2026-07-10, $5 @ 0.68 UFC 329 main): buy leg FILLED on the unified SDK but the probe's fixed 3s wait beat the data-api indexer, so the sell-back never ran. Probe now polls up to 60s; flatten_positions.py is the standalone sell-everything utility (and the emergency flatten). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>