Add new action skills for AL testing and documentation

- Introduced `al-test-writer` to generate AL test codeunits for production objects based on TDD principles.
- Added `al-userguide-test-writer` to create test codeunits from user guide steps, mapping actions and assertions.
- Implemented `bc-extension-test-guide` to generate a comprehensive TEST_GUIDE.md for Business Central extensions, covering various categories.
- Created `bc-webclient-runner` to automate UI testing of the Business Central web client, capturing screenshots and asserting UI states.
- Developed `page-scripting-e2e` to produce a recording plan for Page Scripting, ensuring a structured approach to browser-level testing.

custom/knowledge/integration/use-a-framing-record-for-inbound-polling.bad.al

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+// Anti-pattern: no framing record, no watermark, no lock. Every run fetches the whole
+// collection, and two overlapping Job Queue runs stage the same records twice.
+
+codeunit 50132 "Inbound Poller Bad"
+{
+    TableNo = "Job Queue Entry";
+
+    procedure Poll()
+    var
+        Client: HttpClient;
+        Response: HttpResponseMessage;
+    begin
+        // BAD: "fetch all". No last-fetch datetime feeds the request and no window cap bounds it,
+        // so the cost of every poll grows with the TOTAL data set, not with what is new. Records
+        // that were already staged and resolved are pulled again and reprocessed every run.
+        Client.Get('https://svc.contoso.com/api/orders', Response);
+
+        // BAD: no lock. The Job Queue can start the next run before this one finishes (a run that
+        // overruns its recurrence interval overlaps the following one). Both runs fetch the full
+        // collection concurrently and BOTH stage every order, so each order lands twice and becomes
+        // a duplicate document downstream.
+        StageAll(Response);
+
+        // There is also no watermark to advance, so even back-to-back runs cannot narrow their
+        // windows: there is no notion of "where we left off" anywhere in this design.
+    end;
+}