- Running in gateway mode: expose port 8642 for the API server and
health endpoint, with a note on when it's needed.
- New 'Running the dashboard' section: docker run command with
GATEWAY_HEALTH_URL and env var reference table.
- Docker Compose example: updated to include both gateway and dashboard
services with internal network connectivity (hermes-net), so the
dashboard probes the gateway via http://hermes:8642.
- Concurrent access warning: clarified that running a read-only
dashboard alongside the gateway is safe.
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