feat(community/agents): add AL agent quality guidance

- add 20 agent knowledge rules with good and bad AL samples
- clarify setup dialog shape, temporary persistence, permissions, profiles, instructions, capability registration, and interface wiring
- add the community-owned AL agents review skill
- make review fixture discovery layer-aware with custom, community, and Microsoft precedence
- document layer-aware evaluation behavior

community/knowledge/agents/analyze-message-error-stops-warning-forces-review.good.al

@@ -0,0 +1,26 @@
+codeunit 50100 "Sales Review Agent Task"
+{
+    procedure AnalyzeAgentTaskMessage(AgentTaskMessage: Record "Agent Task Message"; var Annotations: Record "Agent Annotation")
+    var
+        AgentMessage: Codeunit "Agent Message";
+        NotRelevantMsg: Label 'Message is not a sales order task.';
+        NotRelevantDetailsTxt: Label 'Provide a message related to sales order review.';
+    begin
+        if AgentTaskMessage.Type = AgentTaskMessage.Type::Output then begin
+            AgentMessage.UpdateText(AgentTaskMessage, AgentMessage.GetText(AgentTaskMessage) + '\n\nWritten with the help of AI');
+            exit;
+        end;
+        if not IsRelevant(AgentMessage.GetText(AgentTaskMessage)) then begin
+            Annotations.Code := 'RELEVANCE001';
+            Annotations.Severity := Annotations.Severity::Warning;
+            Annotations.Message := NotRelevantMsg;
+            Annotations.Details := NotRelevantDetailsTxt;
+            Annotations.Insert();
+        end;
+    end;
+
+    local procedure IsRelevant(MessageText: Text): Boolean
+    begin
+        exit(MessageText <> '');
+    end;
+}