malkhut: urgency-driven maker/taker + calibrated slippage + chase + docs

MALKHUT/README.md

@@ -543,6 +543,51 @@ The CMA-ES optimizer now receives fill quality metrics in each `EpisodeResult`:
 
 The CMA-ES objective is: maximize fill quality (primary) while maintaining positive PnL.
 
+#### Urgency-Driven Maker/Taker Decision
+
+The system learns WHEN to use maker (passive) vs taker (aggressive) as a function of urgency:
+
+| Urgency | Behavior | Penalty |
+|---------|----------|---------|
+| 0.0 – 0.3 | Passive only (maker). No taker actions generated. | — |
+| 0.3 – 0.65 | IOC partial taker allowed. Small sizes, partial fills. | Low |
+| 0.65 – 1.0 | Full taker allowed. Aggressive crossing at full size. | None |
+
+Two CMA-ES optimizable parameters:
+- `urgency_taker_threshold` (default 0.65): crosses from passive to aggressive
+- `urgency_taker_penalty_bps` (default 2.0): penalty for taker at low urgency
+
+The system learns: "For ADAUSDT in stress regime, threshold=0.4 (thin book → try maker,
+but resort to taker when liquidity appears). For BTCUSDT in normal regime, threshold=0.8
+(deep book → maker always works)."
+
+#### Calibrated Slippage (Flight7 VST + Mainnet Anchors)
+
+Slippage model per-asset, configurable, overridable per-run:
+
+| Book Type | Model | Assets |
+|-----------|-------|--------|
+| **Deep book** | `slippage = alpha * levels + beta * depth_ratio` | BTC, ETH, BNB |
+| **Thin book** | `slippage = intercept + adverse_selection` | DOGE, ADA, UNI, AAVE, ATOM |
+
+Switch: `if book_depth_usd < thin_book_threshold_usd → thin mode`
+
+Fable's Flight7 calibration anchors (testnet + mainnet):
+- Majors: BTC ~0.1 bps, ETH ~0.4 bps (testnet ≈ mainnet)
+- Liquid alts: 3-6 bps testnet, 10-30 bps mainnet (3-6× gap)
+- Thin alts: 14-25 bps testnet, ~140 bps round-trip mainnet
+
+#### Chase Mechanics
+
+Cancel → wait → retry with configurable parameters (CMA-ES optimizable):
+- `wait_to_retry_ms`: delay before re-quoting after cancel (0-2000ms)
+- `chase_enabled`: enable chase-follow behavior
+- `chase_offset_ticks`: ticks from target price to chase (0-10)
+- `chase_max_retries`: max cancel-retry cycles (0-5)
+
+CHASE in the DSL places a limit order at target offset with TTL=wait_to_retry_ms.
+If not filled, the order expires and next step re-places at a new offset.
+
 ### Performance Benchmarks
 
 | Metric | Value |