Sequence diagram showing the browser carries every hop itself -
Authentik and the app never talk directly - with only the OAuth
authorize/token exchange crossing from the browser-facing zone into
the service-to-service zone. Built to the public-repo diagram
conventions in CLAUDE.md (labelBackgroundColor + matching rich-text
span, off-line label positioning, line-color-matched labels, legend
instead of a color-explaining caption).
