Edge-label captions were using an ambient light-dark() background that
didn't match Gitea's actual dark theme. Fixed to a plain rgb(13,17,23),
matching the corrected CLAUDE.md diagram convention.
Adds a real drawio-exported diagram to "Why Four Trust Boundaries,
Not One" showing the physical blast-radius split behind the routing-
authority claim in the text (previously prose-only). Sanitized -
verified no real hostnames/IPs made it into the export.
Also reorders all 14 Systems bullets alphabetically for easier
scanning.
thesabear
