feat(V2): IBKR client read methods + conid LRU cache

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/unit/exchanges/ibkr/test_client.py

@@ -86,3 +86,47 @@ async def test_request_raises_on_persistent_401(httpx_mock: HTTPXMock, client):
     )
     with pytest.raises(IBKRAuthError, match="after retry"):
         await client.get_account()
+
+
+@pytest.mark.asyncio
+async def test_resolve_conid_caches(httpx_mock: HTTPXMock, client):
+    httpx_mock.add_response(
+        url=re.compile(r".*/tickle"), json={"session": "x"},
+    )
+    httpx_mock.add_response(
+        url=re.compile(r".*/trsrv/secdef/search.*symbol=AAPL"),
+        json=[{"conid": 265598, "symbol": "AAPL", "secType": "STK"}],
+    )
+    cid = await client.resolve_conid("AAPL", "STK")
+    assert cid == 265598
+    cid2 = await client.resolve_conid("AAPL", "STK")
+    assert cid2 == 265598
+
+
+@pytest.mark.asyncio
+async def test_get_positions(httpx_mock: HTTPXMock, client):
+    httpx_mock.add_response(url=re.compile(r".*/tickle"), json={})
+    httpx_mock.add_response(
+        url=re.compile(r".*/portfolio/DU1234/positions/0"),
+        json=[{"conid": 265598, "position": 10, "mktPrice": 150}],
+    )
+    res = await client.get_positions()
+    assert isinstance(res, list)
+    assert res[0]["position"] == 10
+
+
+@pytest.mark.asyncio
+async def test_get_ticker_resolves_and_fetches(httpx_mock: HTTPXMock, client):
+    httpx_mock.add_response(url=re.compile(r".*/tickle"), json={})
+    httpx_mock.add_response(
+        url=re.compile(r".*/trsrv/secdef/search.*symbol=AAPL"),
+        json=[{"conid": 265598, "symbol": "AAPL", "secType": "STK"}],
+    )
+    httpx_mock.add_response(
+        url=re.compile(r".*/iserver/marketdata/snapshot"),
+        json=[{"31": "150.5", "84": "150.4", "86": "150.6", "conid": 265598}],
+    )
+    snap = await client.get_ticker("AAPL", "stocks")
+    assert snap["last_price"] == 150.5
+    assert snap["bid"] == 150.4
+    assert snap["ask"] == 150.6