Module vclock 

Vector clock for causal ordering in distributed agent systems.

Responsibility

Provide a per-node logical timestamp that allows agents to establish causal ordering of events without relying on synchronized wall clocks.

Guarantees

• Merge is commutative, associative, and idempotent.
• tick is non-blocking and O(1).
• compare is O(n) in the number of distinct nodes.

Structs

VectorClock

A vector clock: maps node_id to logical timestamp.

Enums

ClockOrder

The causal ordering relationship between two vector clocks.