The frontend's text assets shipped uncompressed on every cold load. Add
Starlette's GZipMiddleware. Measured on the current assets:
- style.css 1,127 KB -> 238 KB (-79%)
- index.html 202 KB -> 35 KB (-83%)
- chat.js 238 KB -> 60 KB (-75%)
minimum_size=1024 skips tiny bodies; Starlette excludes `text/event-stream` by
default, so the SSE streams (chat, shell, research, model-probe — all served with
media_type="text/event-stream") are never compressed or buffered. Composes
cleanly with the existing security-header middleware. No behavioural change.
Built by OdWar -- with Claude thinking alongside.
