Sync Repo-README from project files

Repo-README.-.md

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 > Mirrored from `/mnt/DATA/git/govoplan-admin/README.md`.
 > Origin: `repository`.
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 # GovOPlaN Admin
 
-`govoplan-admin` owns generic administration shell API contributions during the
+`govoplan-admin` owns generic system administration API and WebUI contributions
-GovOPlaN module split.
+during the GovOPlaN module split.
 
 This repository owns the live `governance_templates` and
 `governance_template_assignments` tables while preserving their historical
 table names. It contributes the stable
 `/api/v1/admin/system/governance-templates` routes and owns governance-template
 CRUD plus materialization into access-owned tenant groups and roles.
+
+## WebUI Package
+
+The repository root and `webui/` directory both expose the package
+`@govoplan/admin-webui`. The package does not contribute the `/admin` route
+itself; `govoplan-access` owns the route shell. Instead, admin contributes
+section entries through core's `admin.sections` UI capability:
+
+- overview
+- system settings
+- governance template tenant roles
+- governance template groups
+
+The route shell in access collects those sections at runtime, applies their
+scope requirements, and renders them without importing admin package internals.