Bug fix + fixed a couple rendering issues

fix: exit gracefully on port conflict in dev mode

fix: prevent port conflict in HF Spaces dev mode

feat: SSE keepalive, reconnection, and is_processing flag

replace websocket transport with SSE

fix: buffer websocket events during disconnects and replay on reconnect

fix: simplify onboarding to join-then-oauth flow

feat: cleanup sandbox spaces on session end and increase cookie TTL

feat: require org membership to create sessions

feat: update models to MiniMax M2.5 (fireworks-ai) and Opus 4.6

fix: inject OAuth token into MCP server headers at runtime

fix: route all HF token usage through session.hf_token from OAuth

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

format

functioning frontend and docker

Fix config path to use absolute path from project root

Fix session_manager imports - define Operation/Submission locally

Fix imports and add frontend to gitignore

formatting

Add web frontend infrastructure for HF Agent