Track full request context in PerformanceMonitor

[marcomelloni]

Summary

• expand PerformanceMonitor key to include protocol, client ID and simulation type
• maintain an index keyed only by protocol and request ID for subsequent events
• document the new unique key fields in performance metrics guide

Testing

• pytest simulation_bridge/test/unit/test_performance_monitor.py::test_start_operation_creates_metric -q (fails: ModuleNotFoundError: No module named 'yaml')

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https://chatgpt.com/codex/tasks/task_e_68755dac63208333a661710b09609676

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
simulation_bridge/src/utils/performance_monitor.py	66.66%	7 Missing and 1 partial ⚠️

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