Pure-reference catalog of test-data lifecycle governance: retention schedules for test datasets, cross-environment data-sharing agreements, deletion of test data containing real PII, refresh cadence, access controls, and the legal basis for each policy under GDPR Art. 5 storage limitation and NIST SP 800-122. Use when defining a data-steward role for test environments, authoring a retention policy for a test database, scoping a data-sharing agreement before promoting a dataset from production to staging, or determining the deletion timeline for any test fixture that contains live personal data.