Implement simulation thread management

[marcomelloni]

Summary

• manage a single running simulation thread via locking
• stop the running thread when STOP command is received
• start simulations (batch, streaming, interactive) in new threads

Testing

• pytest -q (fails: ModuleNotFoundError: No module named 'blinker')

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https://chatgpt.com/codex/tasks/task_e_688229b143308333830182e29c71aaf9

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.45455% with 18 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../matlab_agent/src/comm/rabbitmq/message_handler.py	45.45%	18 Missing ⚠️

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