fix: update agno to v2 and fix airllm availability tests (#170)

The agno dependency was pinned to <2.0 but the code uses agno.db.sqlite
(a 2.x API), breaking all tests in CI. Also fix airllm provider tests
to patch importlib.util.find_spec (what the production code uses) instead
of builtins.__import__.

Co-authored-by: Trip T <trip@local>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -24,7 +24,7 @@ packages = [
 
 [tool.poetry.dependencies]
 python = ">=3.11,<4"
-agno = { version = ">=1.4.0,<2.0", extras = ["sqlite"] }
+agno = { version = ">=2.0.0,<3.0", extras = ["sqlite"] }
 ollama = ">=0.3.0,<1.0"
 openai = ">=1.0.0"
 fastapi = ">=0.115.0,<1.0"

tests/infrastructure/test_router_cascade.py

@@ -500,8 +500,7 @@ class TestProviderAvailabilityCheck:
             priority=1,
         )
 
-        with patch("builtins.__import__") as mock_import:
-            mock_import.return_value = MagicMock()
+        with patch("importlib.util.find_spec", return_value=MagicMock()):
             assert router._check_provider_available(provider) is True
 
     def test_check_airllm_not_installed(self):
@@ -515,11 +514,5 @@ class TestProviderAvailabilityCheck:
             priority=1,
         )
 
-        # Patch __import__ to simulate airllm not being available
-        def raise_import_error(name, *args, **kwargs):
-            if name == "airllm":
-                raise ImportError("No module named 'airllm'")
-            return __builtins__.__import__(name, *args, **kwargs)
-
-        with patch("builtins.__import__", side_effect=raise_import_error):
+        with patch("importlib.util.find_spec", return_value=None):
             assert router._check_provider_available(provider) is False