Per connection, marks every ENEMY ghost OUTSIDE the player's lamp radius
IRRELEVANT (monsters in the dark aren't replicated — the gamma test). Modelled
on the proven RegionRelevancySystem: SetIsIrrelevant so players/global ghosts
stay relevant for free. Shared-set discipline — RegionRelevancySystem is the SOLE
clearer (runs every tick); LightRelevancySystem is [UpdateAfter] it and only ADDs
light hides via TryAdd (no clear; defensive against a region+light overlap dup).
Gated on GymTag (LANTERN-only; legacy region relevancy untouched). Pure decision
in LightRelevancyMath (+3 EditMode tests, 500 green). Per-player dim/bright
(variable radius) + the L3 gamma-test verification are follow-ups; the ★adversarial
netcode review is recommended before this ships.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
