Get tournament activity feed

Returns the tournament's organizer audit log, newest first, resolved by slug. This is a single limit-capped window over the most recent entries and is NOT cursor-paginated - there is no way to page past the newest 100 in v1, so poll and diff on id. action is open-ended and grows with new organizer surfaces; treat an unrecognised value as informational. Requires tournaments.tournament_admin:read on the key AND that the caller manages the tournament - the host, a tournament ADMIN, or a tournament MODERATOR. Tournament API access is gated at api_pro on the tournament HOST OWNER's personal developer plan. An organization holding a consumer subscription does not satisfy this - the developer plan ladder has no organization arm.