chore(knowledge): move canonical docs to shared SoMC wiki

design/user-stories/us-010-handle-inactivity-and-selection.md

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----
-type: User Story
-title: "US-010: Handle inactivity and arena vacancies"
-description: Replace inactive role holders through the shared arena without granting legacy pending selections.
-status: done
----
-
-# US-010: Handle inactivity and arena vacancies
-
-As a **participant**, I want inactive central roles to be replaced fairly so that the game does not stall around absent players.
-
-## Acceptance criteria
-
-- [x] A Tyrant or Vigilante who has not logged in for 48 unpaused hours loses the position.
-- [x] Tyrant and Vigilante vacancies use their shared arena challenges rather than random candidate selection.
-- [x] The Tyrant is always excluded from Vigilante selection.
-- [x] Previous role holders may compete for their former role under the same arena eligibility and reset rules as other opted-in participants.
-- [x] Tyrant inactivity ends the reign, clears all assignments, and opens the Tyrant arena challenge; the Vigilante challenge can open only after a Tyrant becomes active.
-- [x] Vigilante inactivity clears Followers and opens the Vigilante arena challenge without changing the Tyrant.
-- [x] Legacy pending role selections are cleared safely into the applicable arena vacancy without granting a role.
-- [x] Candidate selection cannot assign conflicting roles or choose an opted-out player, including during concurrent joins and deaths.
-
-## Related
-
-- [Tyrant game state machine](../concepts/game-state-machine.md)
-- [Inform players and manage participation](us-011-inform-and-manage-participation.md)
-- [Claim the Vigilante role in the arena](us-019-claim-vigilante-in-arena.md)
-- [Claim the Tyrant role in the arena](us-020-claim-tyrant-in-arena.md)