chore(privacy): scrub real-org references from shared/ + root

Replace named real-world entity with fictional generic Norwegian
public-sector entity ("Direktoratet for digital tjenesteutvikling",
DDT) across the design system reference scenarios and root docs.
Repository is a private personal project; references to a real
organization were unintended and unrelated to the project.

- Rename: security-vegvesen.html -> security-direktorat.html
- Persona: replaced with fictional Kari Nordmann
- Domain refs / acronym / rule-IDs: SVV* -> DDT*
- Internal system names (Autosys etc.): replaced with fictional names

Phase 2 (plugin-internal references) follows in next commit.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

shared/playground-design-system/README.md

@@ -31,7 +31,7 @@ shared/
     ├── index.html                   # System showcase (browse all components)
     ├── ros-lier-kommune.html        # Scenario A — ms-ai-architect ROS report
     ├── okr-baerum.html              # Scenario B — OKR live writer
-    ├── security-vegvesen.html       # Scenario C — llm-security findings review
+    ├── security-direktorat.html       # Scenario C — llm-security findings review
     ├── templates.html               # Skeleton + print-template demos
     ├── ros-app.js                   # Scenario A interactivity
     └── ros-data.js                  # Scenario A mock data