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VIOLET_PART_SPEC_OA_TODO_PASS5.md — the DARK mock-BingX execution stack so the full order lifecycle is buildable/testable with zero keys/risk (V4-live later = swap mock for real client). Five independent units extending contracts_v3 (Order/OrderAck/Fill/OrderStatus/PositionDelta): 20. Execution contracts + QuirkProfile seam registry (no quirk logic). 21. Mock BingX order FSM (legal lifecycle, partials, reject, reduce-only-increase rejection). 22. Mock BingX venue adapter (port-conformant, injectable fill model, quirk hooks INERT by default). 23. Fill→position/PnL reducer (PnL from fill_price ONLY; ×leverage-aware) → PositionDelta. 24. DARK E2E gate: ExecIntent → router/driver → mock venue → fill reducer → PASS-4 ledger. CRITICAL per operator: a prominent ⚠️ section makes explicit that BingX "quirks" (zero-wb WS frames, ownership/foreign-fill collision, bound-price poison, ×leverage notional, settle desync, reduce-only edge, setLeverage race, dead .pro TLS) are EXPLICITLY OUT OF SCOPE for PASS 5 — the mock carries injection SEAMS (QuirkProfile, default OFF) to accommodate them LATER, and a real-key boundary smoke remains MANDATORY before V4-live. Quirks sourced from PINK orphan/reconcile + DITAv2 audit memory. Standing ready to write PASS 6–9 (exec internals/reconcile, V5 selection+slots, V6 bible consumers, economics/observability). Added PASS 5 to the review queue in VIOLET_TODO_CRITICAL.md. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>