PSR-14 event hooks are not part of the current public extension surface.
If you are integrating AQG today, use custom PHP rules and TYPO3 configuration instead of relying on unpublished event contracts.
Current State
Accessibility Quality Gate can currently be extended through custom PHP rules, TYPO3 service registration, scheduler setup, and project-level configuration. Public PSR-14 event hooks are planned, but they are not available as part of the current stable documentation.
Next Steps
Stable PSR-14 events and documented integration hooks are planned for a future release. Current extension points are custom rule classes, Services.yaml rule registration, TYPO3 configuration, Scheduler/CLI setup, and project-specific field configuration.