malkhut(T5): risk gate + ASEx + IPC + storage + venue adapter

Risk gate (risk/gate.py): hard invariants — leverage, self-trade, post-only.
ASEx integration (execution/asex_integration.py): validate-before-mutate,
single-writer, zero-lock state serialization.
IPC (ipc/): Zinc SHM (zinc_plane.py) + control plane (control_plane.py),
UVZINC01 seqlock framing.
ClickHouse storage (storage/ch_store.py): 5 tables, HTTP API.
BingX venue adapter (venue/bingx/adapter.py): wraps DITAv2, order tracking.

MALKHUT/malkhut/execution/__init__.py

@@ -0,0 +1,14 @@
+from malkhut.execution.asex_integration import (
+    GuardedFulfilmentState,
+    GuardedRiskState,
+    FulfilmentWorker,
+    RiskWorker,
+    FulfilmentWatch,
+    create_sharded_fulfilment,
+    BookUpdate,
+    AccountUpdate,
+    IntentUpdate,
+    OrderAction,
+    RiskCheck,
+    PolicyReload,
+)