fix: drop unused tests

tests/integration_tests/__init__.py

@@ -1 +0,0 @@
-"""Define any integration tests you want in this directory."""

tests/integration_tests/test_graph.py

@@ -1,11 +0,0 @@
-import pytest
-from langsmith import unit
-
-from agent import graph
-
-
-@pytest.mark.asyncio
-@unit
-async def test_agent_simple_passthrough() -> None:
-    res = await graph.ainvoke({"changeme": "some_val"})
-    assert res is not None

tests/unit_tests/__init__.py

@@ -1 +0,0 @@
-"""Define any unit tests you may want in this directory."""