Values this artifact proposes for the active composition.
Key shape. Slot-name strings (i.e. SomeSlots::Case->value), because
PHP forbids BackedEnum cases as array keys at runtime — referencing
SomeSlots::Case->value preserves IDE refactor-safety over a raw string:
return [
CoreSlots::Currency->value => 'CHF',
CoreSlots::Period->value => 'quarter',
];
Keep this method lightweight — it's called once per artifact during
CompositionParameterSource::fill() for the active dashboard. Return []
to opt out of contributing.