Initial commit: Add project files

templates/dotnet/VerticalSlice/Policy.cs.template

@@ -0,0 +1,10 @@
+namespace __MODULE__.Domain;
+
+public sealed class __POLICY__
+{
+    public Decision Evaluate(ApprovedPointInTimeInput input)
+    {
+        // Pure decision only. No Dapper, HTTP, Hangfire, DateTime.Now, or mutable global state.
+        throw new NotImplementedException();
+    }
+}