Support validated custom audit profile files through the shared engine (#416)

* Support validated operator-owned advanced audit profile files

* Reject lenient custom profile JSON and protect report output aliases

* Link custom audit profile changelog to PR 416

* Make custom JSON rejection fixtures portable across PowerShell versions

.github/workflows/custom-audit-profiles.yml

@@ -0,0 +1,29 @@
+name: Custom audit profile regressions
+on:
+  push:
+    branches: ['**']
+  pull_request:
+  workflow_dispatch:
+permissions:
+  contents: read
+jobs:
+  custom-profiles:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-2022, windows-2025]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Strict input and mocked configuration on Windows PowerShell 5.1
+        shell: powershell
+        run: ./tests/CustomAuditProfiles.Tests.ps1
+      - name: Native read-only custom audit on Windows PowerShell 5.1
+        shell: powershell
+        run: ./tests/CustomAuditProfiles.Windows.Tests.ps1
+      - name: Strict input and mocked configuration on PowerShell 7
+        shell: pwsh
+        run: ./tests/CustomAuditProfiles.Tests.ps1
+      - name: Native read-only custom audit on PowerShell 7
+        shell: pwsh
+        run: ./tests/CustomAuditProfiles.Windows.Tests.ps1