Add poll-backed scheduling backend

README.md

@@ -100,13 +100,18 @@ either module just to find a meeting time.
 
 ## First Package Scaffold Decision
 
-The first implementation slice should add runtime APIs and WebUI routes around
-the existing manifest seed:
+The first backend implementation slice adds runtime APIs and storage around
+poll-backed scheduling requests:
 
-- backend manifest, permissions, DTOs, and APIs for internal polls
-- WebUI route contribution for poll creation and response collection
-- capability contracts for calendar free/busy, access/IDM lookup,
-  mail/notification sending, portal participation links, appointment handoff,
-  and workflow/task follow-up
+- scheduling request, candidate slot, and participant storage
+- automatic `govoplan-poll` availability poll creation
+- signed poll invitations for internal or external participants
+- request lifecycle APIs: draft, collecting, closed, decided, handed off, cancelled
+- result summaries sourced from Poll response aggregation
+- calendar integration preferences and handoff metadata, without hard-coupling
+  Scheduling to Calendar internals
+
+The next slices should add the WebUI, notification delivery, real Calendar
+free/busy checks, and Calendar/Appointments event creation after decision.
 
 The active backlog lives in Gitea issues.