#20 🧪 Add tests for EventEmitter

[Anonymous]

Originally created by: sl4m3

Added comprehensive tests for EventEmitter in src/ledgermind/core/utils/events.py.
The tests cover:

• Subscription logic (adding callbacks, handling duplicates).
• Emission logic (synchronous and asynchronous execution).
• Error handling (ensuring exceptions in subscribers don't crash the emitter).
• Multiple subscribers.

This improves the test coverage and ensures the reliability of the event system.

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PR created automatically by Jules for task 7892444222073059185 started by @sl4m3

[Anonymous]

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