Strengthen review contracts and add AL reliability guidance (#196)

* Strengthen review contracts and HTTP guidance

- add outbound HttpClient transport and HTTP status review rules with paired fixtures`n- resolve layered action-skill overrides deterministically across enabled layers`n- validate findings reports and enforce measurable changed-fixture coverage

* Add data handling and test isolation guidance

- add SCM guidance for deriving base quantities through line unit-of-measure validation`n- add security guidance for parameterizing SetFilter with external text`n- add test isolation guidance for resetting per-test state before initialization guards`n- add web-service guidance for JSON null handling and invariant standard format 9`n- route and cover all five rules with paired evaluation fixtures

* Fix findings report rollup validation

* Validate findings report rollups

* Enforce merged finding identity

* Fix locationless finding deduplication

* Reject conflicting merged corrections

* Detect conflicting leaf corrections

* Route HTTP error checks to canonical web-services knowledge

Let the Error Handling leaf conditionally retrieve the existing HTTP owner articles, preserving applicability and exact-path provenance. Add deterministic source-contract and retrieval regressions without duplicating knowledge rules.

Copilot-Session-Id: a92a7788-103e-4651-9b84-19e34caffb94

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

---------

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

tools/Build-SkillIndex.ps1

@@ -203,9 +203,19 @@ foreach ($layer in 'microsoft', 'community', 'custom') {
     }
 }
 
-$ids = @($records | Group-Object id | Where-Object Count -gt 1)
-if ($ids.Count) {
-    throw "Duplicate action-skill IDs: $($ids.Name -join ', ')"
+$idsWithinLayer = @(
+    $records |
+        Group-Object { "$($_.layer)`0$($_.id)" } |
+        Where-Object Count -gt 1
+)
+if ($idsWithinLayer.Count) {
+    $duplicates = @(
+        $idsWithinLayer | ForEach-Object {
+            $parts = $_.Name -split "`0", 2
+            "$($parts[0]):$($parts[1])"
+        }
+    )
+    throw "Duplicate action-skill IDs within a layer: $($duplicates -join ', ')"
 }
 
 foreach ($record in $records) {