Add tests to verify Node API returns tags

- Add test_get_node_with_tags to verify GET /nodes/{pk} includes tags
- Add test_list_nodes_includes_tags to verify GET /nodes includes tags
- Update existing tests to assert tags field is present

The Node API was already correctly returning tags via the
lazy="selectin" relationship loading strategy. These tests
document and verify that behavior.

tests/test_api/test_nodes.py

@@ -21,6 +21,19 @@ class TestListNodes:
         assert data["total"] == 1
         assert data["items"][0]["public_key"] == sample_node.public_key
         assert data["items"][0]["name"] == sample_node.name
+        assert "tags" in data["items"][0]
+
+    def test_list_nodes_includes_tags(
+        self, client_no_auth, sample_node, sample_node_tag
+    ):
+        """Test listing nodes includes their tags."""
+        response = client_no_auth.get("/api/v1/nodes")
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 1
+        assert len(data["items"][0]["tags"]) == 1
+        assert data["items"][0]["tags"][0]["key"] == sample_node_tag.key
+        assert data["items"][0]["tags"][0]["value"] == sample_node_tag.value
 
     def test_list_nodes_pagination(self, client_no_auth, sample_node):
         """Test node list pagination parameters."""
@@ -54,6 +67,19 @@ class TestGetNode:
         data = response.json()
         assert data["public_key"] == sample_node.public_key
         assert data["name"] == sample_node.name
+        assert "tags" in data
+        assert data["tags"] == []
+
+    def test_get_node_with_tags(self, client_no_auth, sample_node, sample_node_tag):
+        """Test getting a node includes its tags."""
+        response = client_no_auth.get(f"/api/v1/nodes/{sample_node.public_key}")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["public_key"] == sample_node.public_key
+        assert "tags" in data
+        assert len(data["tags"]) == 1
+        assert data["tags"][0]["key"] == sample_node_tag.key
+        assert data["tags"][0]["value"] == sample_node_tag.value
 
     def test_get_node_not_found(self, client_no_auth):
         """Test getting a non-existent node."""