LLMConsumptionUnit

The unit a particular LLMConsumption flavor is measured in (e.g. tokens, credits).

This is an open interface rather than a closed enum so that providers living outside the library can contribute their own units. A unit is identified by its displayLabel, which is also the value written to the "unit" field of serialized consumption JSON.

Implementations are expected to be singletons (objects) so that identity comparison (unit == SomeUnit) is meaningful.

Both shortLabel and displayLabel must be globally unique across all providers on the classpath: they are registry keys, and LLMConsumptionRegistry fails loudly on a collision.

Inheritors