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### Motivation and Context <!-- Thank you for your contribution to the semantic-kernel repo! Please help reviewers and future users, providing the following information: 1. Why is this change required? 2. What problem does it solve? 3. What scenario does it contribute to? 4. If it fixes an open issue, please link to the issue here. --> We don't have a sample showing how to use a mix of agents of various types in an orchestration. This PR adds one. A bug is also discovered in the OpenAIResponsesAgent while creating the sample. ### Description <!-- Describe your changes, the overall approach, the underlying design. These notes will help understanding how your code works. Thanks! --> 1. Add a new sample showing how to use a mix of agents in the Handoff orchestration. 2. Fix a bug in the OpenAIResponsesAgent where the tools were not considering the tools in the kernel instance. A new test is added too. 3. Fix a bug in the AgentActorBase where the intermediate message callback was rejecting ChatMeesageContent type. ### Contribution Checklist <!-- Before submitting this PR, please make sure: --> - [x] The code builds clean without any errors or warnings - [x] The PR follows the [SK Contribution Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md) and the [pre-submission formatting script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts) raises no violations - [x] All unit tests pass, and I have added new tests where possible - [x] I didn't break anyone 😄