Add CMFRT best practices and anti-patterns documentation for various coding standards

custom/knowledge/architecture/cmfrt-buffer-table-api-pattern.bad.al

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+page 55035 "CMFRT AQ FS JJL API"
+{
+    PageType = API;
+    SourceTable = "Job Journal Line"; // real table exposed directly to the API
+
+    trigger OnInsertRecord(BelowxRec: Boolean): Boolean
+    begin
+        // Manual insert/exit boilerplate duplicates the framework insert
+        // and couples the HTTP request to the real-table insert: no retry,
+        // no error queue, one validation error fails the whole request.
+        Rec.Insert(true);
+        Rec.CMFRTAQFSLogIncomingRequest();
+        exit(false);
+    end;
+}