feat(backend/shared): upgrade Copilot SDK, image processing, and agent capabilities

[BOTOOM]

Summary

This PR introduces several critical improvements to the backend and shared logic, focusing on stability with the latest Copilot SDK, enhanced image handling for chat, and proactive web-crawling capabilities for the AI agents.

Key Changes

🚀 Copilot SDK & Stability

• SDK Upgrade & Auth Fix: Updated @github/copilot-sdk to v0.1.28 and implemented the mandatory onPermissionRequest handler (using approveAll) to fix session creation/resumption errors (500).
• Session Resilience: Improved session recovery logic to ensure seamless chat experiences even after server restarts or connection drops.

🛠️ New Agent Capabilities (fetch_url)

• Web Browsing Tool: Integrated a new fetch_url tool that allows agents to read the text content of public URLs provided by the user (documentation, GitHub issues, etc.).
• Proactive Prompts: Updated system prompts for DevOps and Development agents to make them aware of their ability to "browse" the web, ensuring more contextual and accurate responses when links are shared.

🖼️ Image & Media Enhancements

• Pre-upload Architecture: Implemented a new workflow for image handling where images are pre-uploaded and processed before being referenced in the chat stream.
• Optimized Compression: Replaced raw image storage with an optimized JPEG pipeline (90% quality) and smart resizing to prevent large payloads from affecting performance.
• Improved UI Sync: Enhanced the chat schemas to support multi-source images (pasted, dropped, or screenshotted) with proper thumbnail and full-resolution path mapping.

🧹 Maintenance

• Dependency Updates: Upgraded fastify to v5.7.4 and synchronized workspace dependencies.
• Error Handling: Added explicit error reporting in message metadata for better debugging of failed stream responses.

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Project	Deployment	Actions	Updated (UTC)
devmentorai-website-cli	Ready	Preview, Comment	Feb 27, 2026 8:30pm