docs re-org, audit fixes, build fixes

src/Policy/StellaOps.Policy.Engine/Program.cs

@@ -375,8 +375,8 @@ app.MapConflictsApi();
 
 app.Run();
 
-// Make Program class partial to allow integration testing while keeping it minimal
+// Make Program class internal to prevent type conflicts when referencing this assembly
 namespace StellaOps.Policy.Engine
 {
-    public partial class Program { }
+    internal partial class Program { }
 }