Add TableRelation field-length and RecordRef.Open Temp knowledge

- data-modeling: tablerelation-field-length-must-match-related-field
  (exact length for unconditional relations, at least the longest target
  when all relations are conditional; no compile-time diagnostic)
- testing: recordref-open-temp-parameter-defeats-real-table-checks
  (a temp-opened RecordRef is empty, so existence/uniqueness checks on it
  never see persisted rows; cross-links use-generateguid article)
- Wire both into the review leaves and register the fixture pairs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

microsoft/knowledge/data-modeling/tablerelation-field-length-must-match-related-field.bad.al

@@ -0,0 +1,30 @@
+table 50100 "Sample Category"
+{
+    fields
+    {
+        field(1; "Code"; Code[20]) { }
+    }
+    keys
+    {
+        key(PK; "Code") { Clustered = true; }
+    }
+}
+
+table 50102 "Sample Contract"
+{
+    fields
+    {
+        field(1; "Code"; Code[20]) { }
+        // Code[10] cannot hold every "Sample Category"."Code" value (Code[20]).
+        // Compiles without a diagnostic; picking a category code longer than
+        // 10 characters through the lookup fails at runtime.
+        field(2; "Category Code"; Code[10])
+        {
+            TableRelation = "Sample Category"."Code";
+        }
+    }
+    keys
+    {
+        key(PK; "Code") { Clustered = true; }
+    }
+}