feat: propagate intent venue through execution

trex_core/domain/slot/service.py

@@ -85,6 +85,7 @@ class SlotService:
         # dcy-022 / REQ-068: execution policy (set on PENDING entry, cleared on exit).
         timeout_sec: Optional[int] = None,
         slippage_pct: Optional[float] = None,
+        venue: Optional[str] = None,
         extra: Optional[dict[str, Any]] = None,
     ) -> Slot:
         """Transition slot from one state to another atomically.
@@ -133,6 +134,7 @@ class SlotService:
                 take_profit_price=take_profit_price,
                 timeout_sec=timeout_sec,
                 slippage_pct=slippage_pct,
+                venue=venue,
             )
             self._repo.update_slot(updated)
 
@@ -173,6 +175,7 @@ class SlotService:
         take_profit_price: Optional[Decimal] = None,
         timeout_sec: Optional[int] = None,
         slippage_pct: Optional[float] = None,
+        venue: Optional[str] = None,
     ) -> Slot:
         """Compute the post-transition Slot row.
 
@@ -201,6 +204,7 @@ class SlotService:
                 take_profit_price=None,
                 timeout_sec=None,
                 slippage_pct=None,
+                venue="KRX",
                 updated_at=datetime.now(tz=timezone.utc),
             )
 
@@ -267,6 +271,7 @@ class SlotService:
             timeout_sec=new_timeout_sec,
             slippage_pct=new_slippage_pct,
             occupancy_seq=new_occupancy_seq,
+            venue=venue if venue is not None else slot.venue,
             updated_at=datetime.now(tz=timezone.utc),
         )