Examples

Filled documents, one or more per shape. Each carries the Shape line of its shape, so the checks run on it as on any document of that shape: an example that drifts from its shape fails CI.

Example	Shape
Lower bound in a sorted array	algorithm specification
Keep login sessions in a shared store	design document, a change to a running system, invented for the example
Pin the links to reader-ergonomics at its release commit	design document, the proposal behind record 0001
Architecture of reader-ergonomics-software-design	architecture description

The decision record's example is record 0001 itself, and the system diagram's sits in its shape, since a diagram lives inside another document.