Address review: self-contained samples, fixture registration, scoped feature routing

- Declare the sample table in both companions so each compiles on its own.
- Register no-changecompany-in-upgrade and changecompany-runs-triggers-in-the-calling-company in review-fixtures.json.
- Limit the Feature Data Update rule to UpdateData/AfterUpdate and their reachable helpers; read-only IsDataUpdateRequired/ReviewData preflight is permitted and shown as a clean control.
- Add feature data update execution to al-upgrade-review applicability and not-applicable scope.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

microsoft/knowledge/upgrade/no-changecompany-in-upgrade.good.al

@@ -1,3 +1,20 @@
+table 50262 "Sales Order Ext"
+{
+    DataClassification = CustomerContent;
+
+    fields
+    {
+        field(1; "No."; Code[20]) { }
+        field(2; "Shipping Agent Code"; Code[10]) { TableRelation = "Shipping Agent"; }
+        field(3; "Legacy Carrier Code"; Code[10]) { }
+    }
+
+    keys
+    {
+        key(PK; "No.") { Clustered = true; }
+    }
+}
+
 codeunit 50260 "Upgrade Current Company"
 {
     Subtype = Upgrade;
@@ -32,3 +49,48 @@ codeunit 50260 "Upgrade Current Company"
         exit('CONTOSO-1001-ShippingAgentCode-20260101');
     end;
 }
+
+codeunit 50264 "Shipping Agent Feat. Data Upd." implements "Feature Data Update"
+{
+    // Read-only preflight: counting rows across companies to report scope is allowed.
+    procedure IsDataUpdateRequired(): Boolean
+    var
+        Company: Record Company;
+        SalesOrderExt: Record "Sales Order Ext";
+    begin
+        if Company.FindSet() then
+            repeat
+                SalesOrderExt.ChangeCompany(Company.Name);
+                SalesOrderExt.SetRange("Shipping Agent Code", '');
+                if not SalesOrderExt.IsEmpty() then
+                    exit(true);
+            until Company.Next() = 0;
+        exit(false);
+    end;
+
+    procedure ReviewData()
+    begin
+    end;
+
+    // Feature Management runs this once per company, in that company.
+    procedure UpdateData(FeatureDataUpdateStatus: Record "Feature Data Update Status")
+    var
+        SalesOrderExt: Record "Sales Order Ext";
+    begin
+        SalesOrderExt.SetRange("Shipping Agent Code", '');
+        if SalesOrderExt.FindSet(true) then
+            repeat
+                SalesOrderExt.Validate("Shipping Agent Code", SalesOrderExt."Legacy Carrier Code");
+                SalesOrderExt.Modify(true);
+            until SalesOrderExt.Next() = 0;
+    end;
+
+    procedure AfterUpdate(FeatureDataUpdateStatus: Record "Feature Data Update Status")
+    begin
+    end;
+
+    procedure GetTaskDescription(): Text
+    begin
+        exit('Copies legacy carrier codes to the shipping agent code.');
+    end;
+}