feat(vigilante): add arena boss succession

design/user-stories/us-001-start-pause-and-administer.md

@@ -12,15 +12,16 @@ As a **server operator**, I want to start, pause, resume, and inspect the game s
 ## Acceptance criteria
 
 - [x] An administrator can start the first game by assigning the initial Tyrant.
-- [x] The administrator may assign the first Vigilante or allow random selection from eligible recently active players.
+- [x] The administrator may assign the first Vigilante or leave the role vacant for the configured Vigilante arena challenge.
 - [x] An administrator can pause and resume the game without deleting game state.
 - [x] Pausing freezes progression, cooldowns, daily-use timers, inactivity checks, and pending-selection deadlines.
 - [x] Role and class effects are suppressed while paused and restored when play resumes.
 - [x] Administrative commands require the `spigottyrant.admin` permission, granted to server operators by default.
-- [x] Administrators can inspect lifecycle state, roles, classes, Followers, purchases, levels, cooldowns, participation, and pending selections.
+- [x] Administrators can inspect lifecycle state, roles, classes, Followers, purchases, levels, cooldowns, participation, pending selections, and the configured Vigilante arena location.
 - [x] Destructive administrative operations require explicit confirmation.
 
 ## Related
 
 - [Tyrant game state machine](../concepts/game-state-machine.md)
 - [Configure and persist game state](us-012-configure-and-persist-state.md)
+- [Claim the Vigilante role in the arena](us-019-claim-vigilante-in-arena.md)