Function set_level_count 

pub fn set_level_count(n: u8) -> bool

phase-509 P7 (RFC-0108 D8) – which level an executor is, and whether every level of the image is alive: what a supervisor that owns a route per level or feeds a watchdog reads, and what a board’s tier runner states (the level count, and each tier’s level by tier_level_by). Plain atomics in nros-node, so ungated. State how many levels the image runs (its runner does, once, before the levels spin). false, and nothing changed, for 0 or more than MAX_LEVELS. An image that never states it has one level.