Add data-modeling and appsource knowledge articles (MICROSOFT layer) (#65)

Author 7 remedial BCQuality knowledge articles plus good/bad AL samples
(21 files) covering AL master-table and data-model design:

- data-modeling: master No. from number series in OnInsert; use codeunit
  "No. Series" not obsolete NoSeriesManagement; setup table is a singleton;
  set Last Date Modified in OnModify and OnRename; enforce Blocked in
  referencing code not in the master.
- style: ApplicationArea required on page controls (AS0062).
- appsource: object affixes prevent collisions (AS0011).

Clean-room authored from own BC knowledge; specifics verified against public
sources only (learn.microsoft.com, microsoft/BCApps). Introduces two new
domains (data-modeling, appsource).

Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

microsoft/knowledge/style/applicationarea-required-on-page-controls.bad.al

@@ -0,0 +1,25 @@
+page 50375 "Sample App Area Bad"
+{
+    PageType = Card;
+    SourceTable = Customer;
+    layout
+    {
+        area(Content)
+        {
+            group(General)
+            {
+                // Anti-pattern: no ApplicationArea. AS0062 flags this control,
+                // and it is silently hidden in the Web client for profiles whose
+                // enabled areas do not already cover it.
+                field("No."; Rec."No.")
+                {
+                    ToolTip = 'Specifies the number that identifies the customer.';
+                }
+                field(Name; Rec.Name)
+                {
+                    ToolTip = 'Specifies the customer''s name.';
+                }
+            }
+        }
+    }
+}

microsoft/knowledge/style/applicationarea-required-on-page-controls.good.al

@@ -0,0 +1,40 @@
+page 50374 "Sample App Area Good"
+{
+    PageType = Card;
+    SourceTable = Customer;
+    layout
+    {
+        area(Content)
+        {
+            group(General)
+            {
+                field("No."; Rec."No.")
+                {
+                    ApplicationArea = All;
+                    ToolTip = 'Specifies the number that identifies the customer.';
+                }
+                field(Name; Rec.Name)
+                {
+                    ApplicationArea = All;
+                    ToolTip = 'Specifies the customer''s name.';
+                }
+            }
+        }
+    }
+    actions
+    {
+        area(Processing)
+        {
+            action(Refresh)
+            {
+                ApplicationArea = All;
+                ToolTip = 'Reloads the current record.';
+
+                trigger OnAction()
+                begin
+                    CurrPage.Update(false);
+                end;
+            }
+        }
+    }
+}

microsoft/knowledge/style/applicationarea-required-on-page-controls.md

@@ -0,0 +1,28 @@
+---
+bc-version: [all]
+domain: style
+keywords: [application-area, page-control, as0062, appsourcecop, hidden-control, web-client]
+technologies: [al]
+countries: [w1]
+application-area: [all]
+---
+
+# Every page control needs an `ApplicationArea` (AppSourceCop AS0062)
+
+## Description
+
+A field control on a page or pageextension that has no `ApplicationArea` property is silently hidden in the Web client for every profile whose enabled application areas do not cover it. There is no error and no warning at runtime — the field simply does not appear, which reads as data loss to the user. AppSourceCop AS0062 flags any page control or action that is missing the `ApplicationArea` property, and AppSource technical validation rejects the app until it is set.
+
+Set the property to an area the app actually enables. `All` makes the control visible under every profile and is the common default; if the app declares narrower areas in `app.json`, use one of those. The property applies to field controls and to actions. This is a sibling concern to `caption-required-on-page-fields.md` and `tooltip-required-on-page-fields.md`; note that the ToolTip requirement is the separate CodeCop rule AA0218, not AS0062.
+
+## Best Practice
+
+Every field control and action carries `ApplicationArea = All;` (or a declared area of the app). The value is set once per control and keeps the control visible in the Web client.
+
+See sample: `applicationarea-required-on-page-controls.good.al`.
+
+## Anti Pattern
+
+A field control with no `ApplicationArea`. AS0062 flags it, and the control is invisible in the Web client for any profile that does not already enable a matching area.
+
+See sample: `applicationarea-required-on-page-controls.bad.al`.