Clarifies that the event-driven engineering principles apply to infrastructure (Docker, scripts, startup/teardown) and test/scenario execution — NOT frontend HTTP API polling.
Frontend polling (e.g. LiveStats → Ponder GraphQL every 30s) is fine. The scalability solution is caching at the proxy layer (`Cache-Control` headers via Caddy), not WebSocket subscriptions.
Relates to #447
Co-authored-by: openhands <openhands@all-hands.dev>
Reviewed-on: https://codeberg.org/johba/harb/pulls/470
