knowledge(performance): add community rules for JIT, locks, and false positives

These articles capture BC-specific mechanics agents still invert: partial-record JIT on writes, Reset clearing SetLoadFields, HttpClient inside write transactions, and batched number series, plus negative guidance that stops over-eager Query and IsEmpty "fixes".

Co-authored-by: Cursor <cursoragent@cursor.com>

community/knowledge/performance/dataaccessintent-readonly-on-analytical-objects.bad.al

@@ -0,0 +1,15 @@
+report 50100 "Cust List ReadOnly Bad"
+{
+    UsageCategory = ReportsAndAnalysis;
+    ApplicationArea = All;
+    // Missing DataAccessIntent = ReadOnly; the scan hits the primary replica.
+
+    dataset
+    {
+        dataitem(Customer; Customer)
+        {
+            column(No; "No.") { }
+            column(Name; Name) { }
+        }
+    }
+}