When an NPC dies from starvation, their highest-familiarity companion enters mourning for 100 ticks (~half a day). Mourning NPCs skip work: they rest if energy is low, otherwise wander near home. Mourning_ticks counts down each tick through ActionExecutionSystem and is serialized for save/load continuity with backward-compatible default of 0. This gives the familiarity graph its first behavioral consequence.
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