v0.6.0

Added

• OptionGroupDef DTO — declares a CiviCRM option group together with the values it should contain; parsed from the optionGroups mapping section in YAML
• optionGroups section in SchemaDefinition and SchemaApplier — nested dict syntax (groupName → list<{name, label?}>); the option group itself is created via OptionGroup.create if it does not exist, then each value is ensured via the existing OptionValue get-or-create path; dry-run and idempotency are fully supported
• resources/schema/example.yaml updated with an optionGroups example

Fixed

• optionGroups section in YAML was silently ignored by SchemaDefinition::fromArray()