Add DATA_LIFECYCLE.md

Author: alp-topcu

DATA_LIFECYCLE.md

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+# Data Lifecycle
+
+Draft for expert review.
+
+## Stages
+
+1. Contributor reads consent/assent information.
+2. Contributor uploads an AI conversation export.
+3. Raw input is processed by the anonymization service.
+4. Raw input is discarded unless an approved retention exception exists.
+5. Anonymized records enter review and scoring.
+6. Approved records are aggregated for public reporting.
+7. Dataset releases are generated only after privacy checks pass.
+8. Retention and deletion requests are handled according to the final policy.
+
+## Open Questions
+
+- What retention period, if any, is appropriate for raw processing logs?
+- What expert review is required before accepting submissions from minors?
+- What minimum cohort thresholds should apply before publication?