- Add run_stream method to AgentCore for streaming output - Add base_url parameter to LLM clients for OpenRouter support - Add xbot module for new agent implementation - Refactor Chat.vue into composable + components (ChatHeader, ChatMessage, ChatInput, ChatSidebar, ChatAgentSelector) - Add ChatStream handler for SSE streaming in Go server - Add UseXBot field to chat request Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>