Swiss AI Hub v0.301.5

Changed

• 🔄 Event API Streamlining: Refactored the core event system, consolidating various agent-related events such as
  UserMessageEvent, LLMStopEvent, StopEvent, RetrieverEvent, and BotInTheLoop into a unified
  swiss_ai_hub.core.events.agent module for improved organization and discoverability.
• ⚡️ Enhanced Guard Event Clarity: Renamed ContextSufficientEvent to ContextSufficientAcceptEvent and
  ContextInsufficientEvent to ContextInsufficientRejectEvent to explicitly communicate their acceptance or
  rejection semantics, making agent logic clearer.
• 📂 Module Structure Alignment: Relocated core components like AgentConfig and KnowledgeRetriever to more
  logical paths within the swiss_ai_hub.core and swiss_ai_hub.core.generative_ai modules, respectively, enhancing
  the overall package structure.
• 📄 Updated Documentation Examples: Modified the README.md example to reflect the latest event names and module
  paths, ensuring up-to-date guidance for agent development.