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

ai/work-items/index.md

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+# Work Item Index
+
+## Goal
+
+Provide a quick view of active and recently relevant Jira-linked work while keeping the full detail in one file per ticket.
+
+---
+
+## Active
+
+- [pdiap-14859.md](./pdiap-14859.md)
+  `PDIAP-14859` active spike/planning work around dual UIKit/SwiftUI support, dynamic `UIHostingController` removal, and consumer rollout planning.
+
+- [pdiap-15838.md](./pdiap-15838.md)
+  `PDIAP-15838` next story to work on; approved scope removes Apollo and GraphQL-specific iOS transport code while leaving REST.
+
+- [pdiap-15836.md](./pdiap-15836.md)
+  `PDIAP-15836` approved follow-up story for dismissal delegate lifecycle sequencing in pure SwiftUI; comes after `PDIAP-15838`.
+
+## Holding / Closure Pending
+
+- [pdiap-15765.md](./pdiap-15765.md)
+  `PDIAP-15765` authenticated-only TeenIdentityCheck DOB issue; root cause documented and waiting for the right closure timing.
+
+---
+
+## Usage
+
+- Read this file first for active ticket context.
+- Open the specific ticket file when you need exact scope, sequencing, or communication wording.
+- Update the per-ticket file first when ticket context changes materially.