'clean', 'reason_code' => null, 'engine' => 'QA-Test-Double', 'engine_version' => 'fixture', 'signatures_at' => new \DateTimeImmutable('2026-10-08T00:00:00Z'), 'duration_ms' => 1, 'detail' => null]; } public function health(): array { return ['available' => true, 'engine' => 'QA-Test-Double', 'engine_version' => 'fixture', 'signatures_at' => new \DateTimeImmutable('2026-10-08T00:00:00Z'), 'signature_age_hours' => 0.0, 'reason_code' => null]; } }