chore: import upstream snapshot with attribution

contributing/samples/core/empty_agent/tests/go.json

@@ -0,0 +1,37 @@
+{
+  "events": [
+    {
+      "author": "user",
+      "content": {
+        "parts": [
+          {
+            "text": "go"
+          }
+        ],
+        "role": "user"
+      },
+      "id": "e-1",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": ""
+      }
+    },
+    {
+      "author": "empty_agent",
+      "content": {
+        "parts": [
+          {
+            "text": "Okay, I'm ready! What would you like to do or talk about?"
+          }
+        ],
+        "role": "model"
+      },
+      "finishReason": "STOP",
+      "id": "e-2",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": "empty_agent@1"
+      }
+    }
+  ]
+}

contributing/samples/core/empty_agent/tests/hello.json

@@ -0,0 +1,37 @@
+{
+  "events": [
+    {
+      "author": "user",
+      "content": {
+        "parts": [
+          {
+            "text": "Hello"
+          }
+        ],
+        "role": "user"
+      },
+      "id": "e-1",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": ""
+      }
+    },
+    {
+      "author": "empty_agent",
+      "content": {
+        "parts": [
+          {
+            "text": "Hello there! How can I help you today?"
+          }
+        ],
+        "role": "model"
+      },
+      "finishReason": "STOP",
+      "id": "e-2",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": "empty_agent@1"
+      }
+    }
+  ]
+}

contributing/samples/core/empty_agent/tests/how_are_you.json

@@ -0,0 +1,37 @@
+{
+  "events": [
+    {
+      "author": "user",
+      "content": {
+        "parts": [
+          {
+            "text": "How are you?"
+          }
+        ],
+        "role": "user"
+      },
+      "id": "e-1",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": ""
+      }
+    },
+    {
+      "author": "empty_agent",
+      "content": {
+        "parts": [
+          {
+            "text": "As an AI, I don't have feelings or a physical state, so I can't be \"fine\" in the human sense. However, I'm ready and operational to help you!\n\nHow can I assist you today?"
+          }
+        ],
+        "role": "model"
+      },
+      "finishReason": "STOP",
+      "id": "e-2",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": "empty_agent@1"
+      }
+    }
+  ]
+}