Restore expired sessions via summary-based catch-up (#52)

Rename product to ML Intern in frontend

Rebrand frontend to ML Agent

fix: per-session state management for smooth task switching

feat: per-session WebSocket architecture for parallel chat sessions

feat: cooperative cancellation, session persistence, background generation

feat: implement cooperative agent cancellation with cancel button

feat: merge HF Space improvements

making docker run build work

improved design

added code panel, tool approval, tool calls logging

functioning frontend and docker

Add web frontend infrastructure for HF Agent