3 AL/BC patterns: Insert/Delete trigger defaults on master data and declined Confirm in OnValidate (#209)

* Add trigger-default and declined-Confirm knowledge with review cues

Three Microsoft-layer articles with good/bad samples:
- error-handling/declined-confirm-must-abort-not-partially-apply
- data-modeling/delete-master-data-with-trigger
- data-modeling/master-data-must-be-inserted-with-trigger

Wire targeted worklist cues into al-error-handling-review and
al-data-modeling-review and register the samples in review-fixtures.json.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Tighten declined-confirm, delete and insert trigger articles after review

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

microsoft/knowledge/data-modeling/delete-master-data-with-trigger.good.al

@@ -0,0 +1,12 @@
+codeunit 50100 "Sample Currency Cleanup"
+{
+    procedure DeleteRetiredCurrencies(CurrencyFilter: Text)
+    var
+        Currency: Record Currency;
+    begin
+        Currency.SetFilter(Code, CurrencyFilter);
+        // DeleteAll(true) runs Currency.OnDelete for each record: it errors while
+        // open ledger entries use the code and removes the exchange rates itself.
+        Currency.DeleteAll(true);
+    end;
+}