feat: apply rel-001 feedback cleanup

tests/test_v1_portfolios_ledger.py

@@ -58,7 +58,7 @@ def _make_portfolio(
 def _make_trade(**kwargs) -> LedgerTrade:
     defaults = dict(
         ledger_entry_id=1,
-        asset_id=_PORTFOLIO_ID,
+        portfolio_id=_PORTFOLIO_ID,
         order_id="ord-001",
         execution_id="exec-001",
         side="buy",
@@ -130,7 +130,7 @@ def test_ledger_trade_new() -> None:
     assert resp.status_code == 201
     body = resp.json()
     assert body["status"] == "new"
-    assert body["asset_id"] == _PORTFOLIO_ID
+    assert body["portfolio_id"] == _PORTFOLIO_ID
 
 
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