Add 4 community knowledge articles: posting-routine pattern, email module, Word report layout, defensive/offensive blast radius

Contributed from Curabis's own BCQuality custom layer, rewritten to the
community contribution contract (no fenced code in the .md, AL samples as
sibling .good.al/.bad.al files, under 100 lines per article).

community/knowledge/performance/document-reports-should-default-to-word-layout.bad.al

@@ -0,0 +1,15 @@
+report 50140 "Contoso Sales Quote Confirmation"
+{
+    // Document report defaulted to RDLC out of habit — inherits the
+    // sandboxed-app-domain cost for no reason tied to this report's content.
+    DefaultRenderingLayout = RDLC;
+
+    rendering
+    {
+        layout(RDLC)
+        {
+            Type = RDLC;
+            LayoutFile = './Layouts/SalesQuoteConfirmation.rdl';
+        }
+    }
+}