How a screenshot test keeps the UI honest
The gallery photographs every component, so a restyle that breaks a control fails CI instead of a demo.
Metering that bills once, even when the bus delivers twice
Idempotency keys on every meter event, because a durable queue that replays is normal, and double-billing is not.
The one rule we never break: a single policy decision point
No service computes its own authorization answer. Here is why that discipline is worth the inconvenience.
Why colour is never the only signal in our charts
Okabe–Ito hues, dash patterns, markers and direct labels — so a chart reads to a colour-blind reader too.