test(providers): add native-orphan wire fixture (verbatim-replay baseline)

Freeze the wire payload for an unanswered native tool_use whose id is
mirrored top-level in tool_calls (the P1 invariant).  This pins the
verbatim-replay orphan path each provider repairs today — Anthropic via
the provider_content tool_use synthesis, the OpenAI-compatible lane via
sanitize_messages — as the baseline the repair-unification change is
proven byte-identical against.

tests/data/wire_payloads/anthropic_hoist__native_orphan.json

@@ -0,0 +1,70 @@
+{
+  "cache_control": {
+    "type": "ephemeral"
+  },
+  "max_tokens": 4096,
+  "messages": [
+    {
+      "content": "Think about the weather.",
+      "role": "user"
+    },
+    {
+      "content": [
+        {
+          "signature": "sig-abc",
+          "thinking": "The user wants weather.",
+          "type": "thinking"
+        },
+        {
+          "text": "Let me check.",
+          "type": "text"
+        },
+        {
+          "id": "call_1",
+          "input": {
+            "city": "Paris"
+          },
+          "name": "get_weather",
+          "type": "tool_use"
+        }
+      ],
+      "role": "assistant"
+    },
+    {
+      "content": [
+        {
+          "content": "Tool execution was cancelled.",
+          "is_error": true,
+          "tool_use_id": "call_1",
+          "type": "tool_result"
+        }
+      ],
+      "role": "user"
+    }
+  ],
+  "model": "claude-sonnet-4-6",
+  "output_config": {
+    "effort": "medium"
+  },
+  "temperature": 1.0,
+  "thinking": {
+    "type": "adaptive"
+  },
+  "tools": [
+    {
+      "description": "Look up the weather for a city.",
+      "input_schema": {
+        "properties": {
+          "city": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "city"
+        ],
+        "type": "object"
+      },
+      "name": "get_weather"
+    }
+  ]
+}

tests/data/wire_payloads/anthropic_native__native_orphan.json

@@ -0,0 +1,70 @@
+{
+  "cache_control": {
+    "type": "ephemeral"
+  },
+  "max_tokens": 4096,
+  "messages": [
+    {
+      "content": "Think about the weather.",
+      "role": "user"
+    },
+    {
+      "content": [
+        {
+          "signature": "sig-abc",
+          "thinking": "The user wants weather.",
+          "type": "thinking"
+        },
+        {
+          "text": "Let me check.",
+          "type": "text"
+        },
+        {
+          "id": "call_1",
+          "input": {
+            "city": "Paris"
+          },
+          "name": "get_weather",
+          "type": "tool_use"
+        }
+      ],
+      "role": "assistant"
+    },
+    {
+      "content": [
+        {
+          "content": "Tool execution was cancelled.",
+          "is_error": true,
+          "tool_use_id": "call_1",
+          "type": "tool_result"
+        }
+      ],
+      "role": "user"
+    }
+  ],
+  "model": "claude-opus-4-8",
+  "output_config": {
+    "effort": "medium"
+  },
+  "thinking": {
+    "display": "summarized",
+    "type": "adaptive"
+  },
+  "tools": [
+    {
+      "description": "Look up the weather for a city.",
+      "input_schema": {
+        "properties": {
+          "city": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "city"
+        ],
+        "type": "object"
+      },
+      "name": "get_weather"
+    }
+  ]
+}

tests/data/wire_payloads/google__native_orphan.json

@@ -0,0 +1,54 @@
+{
+  "max_tokens": 4096,
+  "messages": [
+    {
+      "content": "Think about the weather.",
+      "role": "user"
+    },
+    {
+      "content": "Let me check.",
+      "role": "assistant",
+      "tool_calls": [
+        {
+          "function": {
+            "arguments": "{\"city\": \"Paris\"}",
+            "name": "get_weather"
+          },
+          "id": "call_1",
+          "type": "function"
+        }
+      ]
+    },
+    {
+      "content": "Tool execution was cancelled.",
+      "role": "tool",
+      "tool_call_id": "call_1"
+    }
+  ],
+  "model": "gemini-2.5-pro",
+  "stream": true,
+  "stream_options": {
+    "include_usage": true
+  },
+  "temperature": 0.5,
+  "tools": [
+    {
+      "function": {
+        "description": "Look up the weather for a city.",
+        "name": "get_weather",
+        "parameters": {
+          "properties": {
+            "city": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "city"
+          ],
+          "type": "object"
+        }
+      },
+      "type": "function"
+    }
+  ]
+}

tests/data/wire_payloads/openai_chat__native_orphan.json

@@ -0,0 +1,54 @@
+{
+  "max_completion_tokens": 4096,
+  "messages": [
+    {
+      "content": "Think about the weather.",
+      "role": "user"
+    },
+    {
+      "content": "Let me check.",
+      "role": "assistant",
+      "tool_calls": [
+        {
+          "function": {
+            "arguments": "{\"city\": \"Paris\"}",
+            "name": "get_weather"
+          },
+          "id": "call_1",
+          "type": "function"
+        }
+      ]
+    },
+    {
+      "content": "Tool execution was cancelled.",
+      "role": "tool",
+      "tool_call_id": "call_1"
+    }
+  ],
+  "model": "gpt-4o-mini",
+  "stream": true,
+  "stream_options": {
+    "include_usage": true
+  },
+  "temperature": 0.5,
+  "tools": [
+    {
+      "function": {
+        "description": "Look up the weather for a city.",
+        "name": "get_weather",
+        "parameters": {
+          "properties": {
+            "city": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "city"
+          ],
+          "type": "object"
+        }
+      },
+      "type": "function"
+    }
+  ]
+}

tests/data/wire_payloads/openai_responses__native_orphan.json

@@ -0,0 +1,55 @@
+{
+  "include": [
+    "reasoning.encrypted_content"
+  ],
+  "input": [
+    {
+      "content": "Think about the weather.",
+      "role": "user",
+      "type": "message"
+    },
+    {
+      "content": "Let me check.",
+      "role": "assistant",
+      "type": "message"
+    },
+    {
+      "arguments": "{\"city\": \"Paris\"}",
+      "call_id": "call_1",
+      "name": "get_weather",
+      "type": "function_call"
+    },
+    {
+      "call_id": "call_1",
+      "output": "Tool execution was cancelled.",
+      "type": "function_call_output"
+    }
+  ],
+  "max_output_tokens": 4096,
+  "model": "gpt-5",
+  "prompt_cache_retention": "24h",
+  "reasoning": {
+    "effort": "medium"
+  },
+  "store": false,
+  "stream": true,
+  "tools": [
+    {
+      "description": "Look up the weather for a city.",
+      "name": "get_weather",
+      "parameters": {
+        "properties": {
+          "city": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "city"
+        ],
+        "type": "object"
+      },
+      "strict": false,
+      "type": "function"
+    }
+  ]
+}

tests/test_wire_payload_golden.py

@@ -211,6 +211,25 @@ FIX_NATIVE_REASONING: list[dict[str, Any]] = [
     {"role": "tool", "tool_call_id": "call_1", "content": "18C, clear."},
 ]
 
+# Native reasoning lane with an UNANSWERED tool_use — the verbatim-replay orphan.
+# The native ``tool_use`` is mirrored top-level in ``tool_calls`` (the P1 invariant),
+# so the send-time repair can synthesize its cancellation result by reading
+# ``tool_calls`` alone.  Exercises the Anthropic verbatim-replay branch that the old
+# per-provider ``pc_tool_ids`` synthesis covered.
+FIX_NATIVE_ORPHAN: list[dict[str, Any]] = [
+    {"role": "user", "content": "Think about the weather."},
+    {
+        "role": "assistant",
+        "content": "Let me check.",
+        "_provider_content": [
+            {"type": "thinking", "thinking": "The user wants weather.", "signature": "sig-abc"},
+            {"type": "text", "text": "Let me check."},
+            {"type": "tool_use", "id": "call_1", "name": "get_weather", "input": {"city": "Paris"}},
+        ],
+        "tool_calls": [_tc("call_1")],
+    },
+]
+
 # Multipart user content (image attachment as the provider receives it today).
 FIX_MULTIPART: list[dict[str, Any]] = [
     {
@@ -249,6 +268,10 @@ _FIXTURES: dict[str, tuple[list[dict[str, Any]], dict[str, Any]]] = {
         FIX_NATIVE_REASONING,
         {"tools": _TOOLS, "replay_reasoning_to_model": True},
     ),
+    "native_orphan": (
+        FIX_NATIVE_ORPHAN,
+        {"tools": _TOOLS, "replay_reasoning_to_model": True},
+    ),
     "multipart": (FIX_MULTIPART, {}),
     "operator_system": (FIX_OPERATOR_SYSTEM, {"tools": _TOOLS}),
 }