orion-ecs / keen-eye / 20012213345

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Implement inter-system messaging with typed message bus (#74)

Add a MessageManager class that provides decoupled communication between
systems using type-safe messages. Key features:

- Immediate message dispatch via Send<T>() with O(N) delivery
- Subscription with IDisposable pattern for clean unsubscription
- Message queuing for deferred delivery via QueueMessage<T>()
- Process queued messages all at once or per-type
- Zero overhead when no handlers are registered
- HasMessageSubscribers<T>() optimization to skip expensive message creation

The implementation follows the existing manager pattern:
- MessageManager is internal, World is the public entry point
- Thin delegation methods in World.cs
- Full XML documentation on all public APIs

Includes 46 comprehensive unit tests covering:
- Send/Subscribe functionality
- Queuing and deferred processing
- Multiple message types
- Edge cases and error handling
- Inter-system communication scenarios

Updates ROADMAP.md to mark Phase 7 (Inter-System Messaging) as complete.

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