Integrate embabel-version that uses chat-store directly

[jasperblues]

PR: Upgrade to embabel-agent 0.3.4

Bottom Line

Upgrade to embabel-agent:0.3.4-SNAPSHOT which integrates chat-store. This means:

• Stop creating chat messages manually - agent handles persistence via ConversationFactory
• Still use chat-store for reads - session queries unchanged
• Use chat-store events - WebSocket delivery triggered by MessageEvent(ADDED)

Changes

Dependencies

• embabel-agent: 0.3.3 → 0.3.4-SNAPSHOT
• embabel-chat-store: 0.1.0 → 0.2.0-SNAPSHOT
• Added embabel-agent-chatstore-autoconfigure

Write Path (Changed)

• ChatSessionService.addMessage() now uses ConversationFactory instead of direct repository calls
• MessageEventListener delivers messages to WebSocket on MessageEvent(ADDED)
• JesseService no longer sends WebSocket messages directly

Read Path (Unchanged)

• Session queries still use ChatSessionRepository

System User

• Jesse initialized as GuideUserData on startup for assistant message authorship

Files Modified

• pom.xml
• ChatSessionService.kt
• JesseService.kt
• DeliveredMessage.kt
• New: MessageEventListener.kt