Implement core backend domain and API workflows

README.md

@@ -43,3 +43,13 @@ Fresh full-stack starter scaffold:
   ```powershell
   pwsh ./scripts/check-coverage.ps1 -MinLineRate 0.90 -MinBranchRate 0.70
   ```
+
+## Implemented Backend Scope
+
+- Auth: register, login, logout, current user context
+- Rulesets: d6 and dnd5e validation rules
+- Campaigns: create/list/read
+- Characters: create/update/activate/current-campaign list
+- Skills: create/update with ruleset-aware dice expression validation
+- Rolls: public/private skill rolls with append-only campaign log
+- State stream: SSE endpoint for campaign version updates