Add OneSettings auditing and Security warning controls (#408)

* Add explicit OneSettings auditing and Security warning controls

* Reference PR 408 in notification changelogs

* Handle expected child CLI failure under Windows PowerShell 5.1

* Block dependent Privacy channel changes when OneSettings policy drifts

* Recheck notification producer prerequisites at channel write boundaries

.github/workflows/audit-notifications.yml

@@ -0,0 +1,28 @@
+name: Audit notification regressions
+on:
+  push:
+    branches: ['**']
+  pull_request:
+  workflow_dispatch:
+permissions:
+  contents: read
+jobs:
+  audit-notifications:
+    strategy:
+      matrix:
+        os: [windows-2022, windows-2025]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Fixtures on Windows PowerShell 5.1
+        shell: powershell
+        run: ./tests/AuditNotifications.Tests.ps1
+      - name: Native read-only observations on Windows PowerShell 5.1
+        shell: powershell
+        run: ./tests/AuditNotifications.Windows.Tests.ps1
+      - name: Fixtures on PowerShell 7
+        shell: pwsh
+        run: ./tests/AuditNotifications.Tests.ps1
+      - name: Native read-only observations on PowerShell 7
+        shell: pwsh
+        run: ./tests/AuditNotifications.Windows.Tests.ps1