malkhut: standardized order types — FIX/CCXT-aligned, multi-exchange mapping
order_types.py: Five-layer taxonomy normalized to industry standards:
Layer 1: Base types (FIX Tag 40) — MARKET, LIMIT
Layer 2: Time-in-force (FIX Tag 59) — GTC, IOC, FOK, GTD
Layer 3: Conditional/Trigger (FIX Tag 3/4+MIT) — STOP_MARKET, STOP_LIMIT,
TRIGGER_MARKET, TRIGGER_LIMIT, TRAILING_STOP
Layer 4: Instructions (FIX Tag 18) — POST_ONLY, REDUCE_ONLY, HIDDEN, ICEBERG
Layer 5: Compound (exchange-specific) — OCO, TP_SL
Cross-exchange mapping: BingX ↔ Binance ↔ Bybit (from CCXT source code).
Standards: FIX 4.4 Tag 40/59/18, CCXT unified API, ISO 10383 (MIC).
Transferability: strategy PARAMETERS transfer. ORDER TYPE NAMES are
venue-specific but semantics identical (LIMIT = LIMIT everywhere).
14 tests. README updated with full mapping table and standards references.
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