Demo: dockerstats

3 windows side by side:

1. The publisher CLI in simulate mode, with 3 fake hosts × 3 atSigns each at 2-second polling.
2. The subscriber CLI, printing one line per arriving StatSample.
3. The Flutter dashboard, showing 4 charts with a 5-min rolling window and host → atSign drill-down.

Speaker script is in speaker-script.md, with running commentary you can read while the demo plays.