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.

MALKHUT/README.md

@@ -136,6 +136,7 @@ MALKHUT/
 │   │   ├── pipeline.py          # Bounded continuous learning loop + logger
 │   │   ├── dsl.py               # Strategy DSL v2 (40+ primitives, 40+ sensors)
 │   │   ├── generator.py         # Genetic programming strategy evolution
+│   │   ├── order_types.py       # Standardized order type enum (FIX/CCXT-aligned)
 │   │   ├── selector.py          # Regime → strategy mapping + performance matrix
 │   │   ├── asset_classification.py  # Multi-label taxonomy + exchange registry
 │   │   ├── asset_behavior.py    # 10-dimension behavior DSL, research-validated
@@ -468,6 +469,7 @@ Re-measurement at correct fees is required for production deployment.
 | **Policy Registry** | `training/registry.py` | 14 | CANDIDATE → ACTIVE lifecycle |
 | **Training Pipeline** | `training/pipeline.py` | 21 | Bounded continuous learning loop |
 | **Strategy DSL v2** | `training/dsl.py` | 69 | 40+ primitives, 40+ sensors, 16 builtins |
+| **Order Types** | `training/order_types.py` | (new) | FIX/CCXT-aligned, 5-layer taxonomy, cross-exchange mapping |
 | **Strategy Generator** | `training/generator.py` | 20 | Genetic programming: crossover, mutation, tournament |
 | **Strategy Selector** | `training/selector.py` | 24 | Regime → strategy mapping, performance matrix |
 | **Asset Classification** | `training/asset_classification.py` | 190 | Multi-label taxonomy + exchange registry, 13 assets, system-wide store |
@@ -1191,6 +1193,52 @@ zero fidelity loss). CMA-ES training speedup is ~1.5x because multiprocessing ov
 is amortized across 90 scenarios per eval. Bottleneck is planner (MCTS), not CWM —
 numba already accelerates the CWM hot path (`_HAS_NUMBA = True`).
 
+### Order Type Standardization (Multi-Exchange, FIX/CCXT-Aligned)
+
+Normalized order type taxonomy based on **FIX Protocol Tag 40 (OrdType)** as the
+universal reference, with **CCXT** de facto crypto standard for practical interop.
+Neither MiFID II nor MiCA defines a standalone order type taxonomy — both defer to FIX.
+
+**Five-layer hybrid model:**
+
+| Layer | Standard Source | Types |
+|-------|----------------|-------|
+| 1. Base | FIX Tag 40 | `MARKET`, `LIMIT` |
+| 2. Time-in-force | FIX Tag 59 | `GTC`, `IOC`, `FOK`, `GTD` |
+| 3. Conditional/Trigger | FIX Tag 3/4 + MIT | `STOP_MARKET`, `STOP_LIMIT`, `TRIGGER_MARKET`, `TRIGGER_LIMIT`, `TRAILING_STOP` |
+| 4. Instructions | FIX Tag 18 | `POST_ONLY`, `REDUCE_ONLY`, `HIDDEN`, `ICEBERG` |
+| 5. Compound | Exchange-specific | `OCO`, `TP_SL` |
+
+#### Cross-Exchange Mapping (BingX ↔ Binance ↔ Bybit)
+
+| Normalized | BingX | Binance Spot | Binance Futures | Bybit |
+|-----------|-------|-------------|-----------------|-------|
+| `LIMIT` | LIMIT | LIMIT | LIMIT | LIMIT |
+| `MARKET` | MARKET | MARKET | MARKET | MARKET |
+| `POST_ONLY` | POST_ONLY | LIMIT_MAKER | LIMIT_MAKER | Post-Only |
+| `IOC` | IOC | IOC | IOC | IOC |
+| `FOK` | FOK | FOK | FOK | FOK |
+| `STOP_MARKET` | TRIGGER_MARKET | STOP_MARKET | STOP_MARKET | Stop-Market |
+| `STOP_LIMIT` | TRIGGER_LIMIT | STOP_LOSS_LIMIT | STOP | Stop-Limit |
+| `TP_MARKET` | TRIGGER_MARKET | TAKE_PROFIT | TAKE_PROFIT_MARKET | TP-Market |
+| `TP_LIMIT` | TRIGGER_LIMIT | TAKE_PROFIT_LIMIT | TAKE_PROFIT | TP-Limit |
+| `TRAILING_STOP` | TRIGGER_MARKET(trail) | (spot only) | TRAILING_STOP_MARKET | Trailing |
+
+#### Transferability Principle
+
+Strategy **PARAMETERS** transfer across exchanges. Order type **NAMES** are venue-specific
+but semantics are identical. A `LIMIT` on BingX = `LIMIT` on Binance = `LIMIT` on Bybit
+(same fill behavior). Only the API string differs. The venue adapter translates
+normalized → exchange-native at submission time.
+
+#### Standards Referenced
+
+- FIX 4.4: Tag 40 (OrdType), Tag 59 (TimeInForce), Tag 18 (ExecInst)
+- CCXT: unified `limit`/`market` + parameter composition (triggerPrice, stopPrice)
+- ISO 10383: MIC for venue identification
+- MiFID II / MiCA: defers to FIX for order type classification
+- FIA: references FIX Tag 40 in digital asset guidelines
+
 ### Prod Tooling
 
 | Component | Purpose | File |