chore: import upstream snapshot with attribution

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

@@ -0,0 +1,40 @@
+{
+  "events": [
+    {
+      "author": "user",
+      "content": {
+        "parts": [
+          {
+            "text": "Hello"
+          }
+        ],
+        "role": "user"
+      },
+      "id": "e-1",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": ""
+      }
+    },
+    {
+      "author": "logprobs_demo_agent",
+      "content": {
+        "parts": [
+          {
+            "text": "Hello there! How can I help you today?"
+          },
+          {
+            "text": "\n\n---\n\n### \ud83d\udcca Log Probability Analysis\n\n* **Average Log Probability**: -0.1564\n* **Confidence Level**: High\n* **Confidence Score**: 89.7%\n* **Top Alternatives Analyzed**: 10"
+          }
+        ],
+        "role": "model"
+      },
+      "finishReason": "STOP",
+      "id": "e-2",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": "logprobs_demo_agent@1"
+      }
+    }
+  ]
+}

contributing/samples/core/logprobs/tests/tell_joke.json

@@ -0,0 +1,40 @@
+{
+  "events": [
+    {
+      "author": "user",
+      "content": {
+        "parts": [
+          {
+            "text": "Tell me a joke"
+          }
+        ],
+        "role": "user"
+      },
+      "id": "e-1",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": ""
+      }
+    },
+    {
+      "author": "logprobs_demo_agent",
+      "content": {
+        "parts": [
+          {
+            "text": "Why don't scientists trust atoms?\n\nBecause they make up everything!"
+          },
+          {
+            "text": "\n\n---\n\n### \ud83d\udcca Log Probability Analysis\n\n* **Average Log Probability**: -0.4411\n* **Confidence Level**: High\n* **Confidence Score**: 73.7%\n* **Top Alternatives Analyzed**: 15"
+          }
+        ],
+        "role": "model"
+      },
+      "finishReason": "STOP",
+      "id": "e-2",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": "logprobs_demo_agent@1"
+      }
+    }
+  ]
+}

contributing/samples/core/logprobs/tests/what_is_ai.json

@@ -0,0 +1,40 @@
+{
+  "events": [
+    {
+      "author": "user",
+      "content": {
+        "parts": [
+          {
+            "text": "What is AI?"
+          }
+        ],
+        "role": "user"
+      },
+      "id": "e-1",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": ""
+      }
+    },
+    {
+      "author": "logprobs_demo_agent",
+      "content": {
+        "parts": [
+          {
+            "text": "Artificial Intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. These processes include learning (the acquisition of information and rules for using the information), reasoning (using rules to reach approximate or definite conclusions), and self-correction.\n\nThe ultimate goal of AI is to enable machines to perform tasks that typically require human intelligence, such as understanding natural language, recognizing patterns, solving problems, making decisions, and even learning from experience."
+          },
+          {
+            "text": "\n\n---\n\n### \ud83d\udcca Log Probability Analysis\n\n* **Average Log Probability**: -0.1382\n* **Confidence Level**: High\n* **Confidence Score**: 90.9%\n* **Top Alternatives Analyzed**: 92"
+          }
+        ],
+        "role": "model"
+      },
+      "finishReason": "STOP",
+      "id": "e-2",
+      "invocationId": "i-1",
+      "nodeInfo": {
+        "path": "logprobs_demo_agent@1"
+      }
+    }
+  ]
+}