feat(groups): add fail-closed admission management

design/us-005-user-dashboard.md

@@ -3,7 +3,7 @@ type: User Story
 title: Manage linked accounts from the dashboard
 description: Authenticated users maintain their profile and active Java Edition accounts.
 tags: [player, dashboard, minecraft, profile]
-timestamp: 2026-08-01T22:04:17Z
+timestamp: 2026-08-01T22:34:31Z
 story_id: US-005
 status: verified
 ---
@@ -22,6 +22,8 @@ As a registered player, I want to manage my profile and linked Minecraft account
 - [x] Removing a primary account promotes another active account when one exists.
 - [x] Name and primary changes preview the expected Discord nickname and require explicit confirmation before either profile mutation occurs.
 - [x] The dashboard shows recent portal and game IP observations with classification and available location.
+- [x] The dashboard shows the user's Discord display name, username, guild nickname, and immutable Discord ID.
+- [x] The dashboard shows effective access groups and whether each group grants Minecraft access.
 - [x] The user can revoke the current session by signing out.
 
 # Implementation