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This PR fixes a bug where `model_context` was either ignored or explicitly set to `None` during agent deserialization (`_from_config`) in: - `AssistantAgent`: `model_context` was serialized but not restored. - `SocietyOfMindAgent`: `model_context` was neither serialized nor restored. - `CodeExecutorAgent`: `model_context` was serialized but not restored. As a result, restoring an agent from its config silently dropped runtime context settings, potentially affecting agent behavior. This patch: - Adds proper serialization/deserialization of `model_context` using `.dump_component()` and `load_component(...)`. - Ensures round-trip consistency when using declarative agent configs. ## Related issue number Closes #6336 ## Checks - [ ] I've included any doc changes needed for <https://microsoft.github.io/autogen/>. See <https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md> to build and test documentation locally. - [x] I've added tests (if relevant) corresponding to the changes introduced in this PR. - [x] I've made sure all auto checks have passed. --------- Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>