RAG expansion + Optimal API

docs/features/README.md

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+# Feature Documentation
+
+Documentation for features organized by team.
+
+## Structure
+
+- `/backend/` - Backend features (be-doc writes)
+- `/frontend/` - Frontend features (fe-doc writes)
+- `/ux_ui/` - UX/UI features (ux-doc writes)
+- `/shared/` - Cross-team features (any documenter writes)
+
+## Access
+
+Each team subdirectory follows the same access pattern as the main team docs.
+The `/shared/` directory is readable by all and writable by any documenter.