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/binary-choice-must-be-boolean.good.al

@@ -0,0 +1,16 @@
+table 50100 "Sales Task"
+{
+    fields
+    {
+        field(1; "No."; Code[20]) { }
+        field(10; Blocked; Boolean) { }
+    }
+}
+
+codeunit 50100 "Sales Task Check"
+{
+    procedure IsOverdue(DueDate: Date): Boolean
+    begin
+        exit(DueDate < Today);
+    end;
+}