Forward ledger venue provenance to Portfolio Hub (#99)

Co-authored-by: Hermes Agent <noreply@nousresearch.com>

tests/adapters/ledger/test_portfolio_hub_ledger.py

@@ -17,11 +17,13 @@ from trex_core.application.ledger_port import (
 )
 
 
-def _trade(asset="PF-1", execution_id="paper:PAPER-000001:10") -> LedgerTrade:
+def _trade(asset="PF-1", execution_id="paper:PAPER-000001:10", *,
+           venue=None, order_venue="KRX") -> LedgerTrade:
     return LedgerTrade(
         asset_id=asset, order_id="PAPER-000001", execution_id=execution_id,
         side="buy", qty=10, price=1000.0, fee=1.5, tax=0.0,
         executed_at=datetime(2026, 6, 4, 9, 0, tzinfo=timezone.utc),
+        venue=venue, order_venue=order_venue,
     )
 
 
@@ -29,6 +31,20 @@ def _client(handler):
     return httpx.Client(transport=httpx.MockTransport(handler))
 
 
+def test_payload_maps_execution_and_order_venues():
+    cases = [
+        (None, "SOR"),
+        ("KRX", "NXT"),
+        ("NXT", "KRX"),
+    ]
+    for execution_venue, order_venue in cases:
+        body = PortfolioHubLedger._payload(
+            _trade(venue=execution_venue, order_venue=order_venue)
+        )
+        assert body["execution_venue"] == execution_venue
+        assert body["order_venue"] == order_venue
+
+
 def test_post_contract_includes_execution_id_and_path_uses_portfolio_id():
     captured = {}