fix: normalize ollama tool calls from content and thinking

test/response-rewriter.test.ts

@@ -49,4 +49,25 @@ describe('Response Rewriter', () => {
     expect(result.message.content).toBe("Here are the calls"); // not cleared
     expect(result.message.tool_calls).toHaveLength(1);
   });
+
+  it('rewrites tool call found in thinking into structured tool_calls', () => {
+    const inputResponse: OllamaChatResponse = {
+      model: "test-model",
+      done: true,
+      message: {
+        role: "assistant",
+        content: "",
+        thinking: "<tool_call>\n{\"name\":\"read\",\"arguments\":{\"path\":\"/tmp/test.txt\"}}\n</tool_call>"
+      }
+    };
+
+    const result = rewriteResponse(inputResponse);
+
+    expect(result.message.content).toBe("");
+    expect(result.message.tool_calls).toBeDefined();
+    expect(result.message.tool_calls).toHaveLength(1);
+    expect(result.message.tool_calls![0].function.name).toBe("read");
+    expect(result.message.tool_calls![0].function.arguments).toEqual({ path: "/tmp/test.txt" });
+    expect(result.message.thinking).toBe("");
+  });
 });