v0.17.2

🚀 Major Changes

• Stateless MCP Service – Reworked the MCP client to be fully stateless: no persistent event loop, no keep-alive workers, no eager server startup. Tool definitions are discovered once (brief connect → list → disconnect) and cached; each tool call creates a temporary session, executes, and tears down immediately. This results in faster runtime and smaller memory footprint.
• Background MCP Discovery – Agent activation now starts MCP discovery in a background thread (non-blocking), reducing activation time.
• Improved Context & Memory Handling – Tool rejection reasons and user feedback (e.g., “ask” tool answers) are now preserved in memory and context, improving multi-turn conversation quality.
• Voyage Embedding Only – Removed OpenAI embedding fallback; only Voyage (model voyage-4) is used as third-party embedding model.

🐛 Bug Fixes

• Fixed issue where vision preprocessing would reject model IDs containing a slash.
• Fixed memory-related issues (multiple fixes).
• Fixed ask tool pairing across parallel calls in local agent.

🔧 Chores

• Simplified MCPSessionManager – removed thread/loop management, now purely stateless.