feat: Refactor work item management and documentation for clarity and structure

ai/work-items/pdiap-15765.md

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+# PDIAP-15765 - AO DOB field error not showing investigation
+
+## Status
+
+- Holding
+- Ready for closure timing review
+
+---
+
+## Context
+
+- This ticket is tied to an AO DOB validation issue.
+- The issue was confirmed in the `TeenIdentityCheck` flow for authenticated users.
+
+---
+
+## Confirmed Findings
+
+- The issue reproduces only for authenticated users based on the currently stored evidence.
+- Root cause was documented.
+- The original external report was incomplete.
+
+---
+
+## Current Guidance
+
+- Treat the issue as scoped and understood unless new evidence appears.
+- Keep the authenticated-user qualifier whenever this ticket is mentioned.
+- Do not describe it as a generic validation issue without the `TeenIdentityCheck` and auth context.
+
+---
+
+## Next Step
+
+- Jeff approved moving the story to Done once the new sprint starts.