Add initial polling backend logic

README.md

@@ -36,6 +36,17 @@ resolution, permission checks, and role templates. Without Access, Poll remains
 usable for reduced flows such as anonymous participation, signed public links,
 or participant lists supplied by another adapter.
 
+## Current Backend Slice
+
+The first backend implementation adds poll storage, option storage, response
+storage, validation, result aggregation, tenant summaries, module migrations,
+and authenticated API routes for:
+
+- single-choice, multiple-choice, yes/no, ranked-choice, and availability polls
+- opening, closing, and deciding polls
+- submitting and updating respondent answers
+- listing responses and reading result summaries
+
 ## Development Install
 
 ```bash