StepThroughDiagram
A diagram that builds itself as you scroll its step list — each step reveals the part of the picture it talks about.
Scroll through the numbered steps — each one reveals its part of the SVG and earlier parts stay visible. Reduced-motion shows the full diagram at once.
- 1 A commit lands on the branch.
- 2 Unit tests run first — fast, no network.
- 3 Only a green unit run pays for the e2e suite.