Add 18 community AL/BC patterns across style, data-modeling, web-services, appsource, breaking-changes, performance, and testing

Contributed by CURABIS ApS, generalized from patterns observed across real AppSource/PTE development. Each article follows the knowledge file format (frontmatter, Description/Best Practice/Anti Pattern, sibling .good.al/.bad.al samples).

microsoft/knowledge/style/namespace-must-be-verified-from-source.bad.al

@@ -0,0 +1,13 @@
+namespace Contoso.Extensions;
+
+using System.Performance; // guessed; never verified against the source file
+
+codeunit 50100 "Tooling Extension"
+{
+    procedure Run()
+    var
+        ToolingPage: Page "Some Tooling Page"; // resolves in a local build, fails in VS Code
+    begin
+        ToolingPage.Run();
+    end;
+}