3.0.0

• Major simplification and optimization: Removed Factory, Strategy, Processor, Metrics.
• Dual-system architecture: Separated concerns between Event (notifications) and Effect (side operations).
• Structured side effect management: Effects now handle flow collection, deferred execution, and cancellation.
• Simplified core: ReducerFeature uses a channel for commands and a scan to manage state transitions.
• Enhanced type safety: Clear separation between events and operational effects.