Close REUSE-WP-0011 follow-ups: archive, docs, A4 promotion

- Archive workplan to workplans/archived/260615-REUSE-WP-0011-*.md
- Document browser landing page routing in FederationHubAPI and deploy docs
- Promote capability.registry.register to A4 (hosted hub API evidence)
- Update SCOPE finished workplan list

docs/deploy/reuse-kubernetes.md

@@ -26,6 +26,16 @@ Mount a PVC at `/data` for persistence. Inject secrets via Kubernetes Secret
 
 - Liveness/readiness: `GET /health` on port `8000`
 
+## Browser landing page
+
+Production ingress routes HTTPS `/` to a static landing Deployment
+(`reuse-surface-landing`, **RAILIANCE-WP-0008**). API paths are unchanged:
+
+- `/health` and `/v1/*` → hub service container
+- `/` → informational HTML for browser visitors (no login, no secrets)
+
+Agents and CLI clients should target `/health` and `/v1/*` only, not `/`.
+
 ## Public URL and DNS
 
 | Item | Value |