feat(classes): add tyrant class assignment

design/user-stories/us-004-assign-unlocked-classes.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-004: Assign unlocked classes"
 description: Let the Tyrant assign each purchased class to one eligible participant.
-status: backlog
+status: done
 ---
 
 # US-004: Assign unlocked classes
@@ -11,14 +11,14 @@ As the **Tyrant**, I want to assign unlocked specialist classes so that I can bu
 
 ## Acceptance criteria
 
-- [ ] The Tyrant can assign only Assassin, Fixer, and Tamer classes purchased during the current reign.
-- [ ] Each class can be assigned to at most one player at a time, and a player can hold at most one Tyrant-side class.
-- [ ] Role alignment and Tyrant-side class are independent: the Vigilante or a Follower may simultaneously be the Assassin, Fixer, or Tamer.
-- [ ] The Tyrant cannot assign a class to the Tyrant, an opted-out player, or another ineligible player.
-- [ ] Reassignment removes the class and its bound items and effects from the previous holder before granting it to the new holder.
-- [ ] Assignment and removal are stored by UUID and communicated clearly to affected players.
-- [ ] A class holder is reminded of the assignment and its controls on login.
-- [ ] All class assignments end when the Tyrant's reign ends.
+- [x] The Tyrant can assign only Assassin, Fixer, and Tamer classes purchased during the current reign.
+- [x] Each class can be assigned to at most one player at a time, and a player can hold at most one Tyrant-side class.
+- [x] Role alignment and Tyrant-side class are independent: the Vigilante or a Follower may simultaneously be the Assassin, Fixer, or Tamer.
+- [x] The Tyrant cannot assign a class to the Tyrant, an opted-out player, or another ineligible player.
+- [x] Reassignment removes the class and its bound items and effects from the previous holder before granting it to the new holder.
+- [x] Assignment and removal are stored by UUID and communicated clearly to affected players.
+- [x] A class holder is reminded of the assignment and its controls on login.
+- [x] All class assignments end when the Tyrant's reign ends.
 
 ## Related