feat: add PolicyPackSelectorComponent with tests and integration

- Implemented PolicyPackSelectorComponent for selecting policy packs.
- Added unit tests for component behavior, including API success and error handling.
- Introduced monaco-workers type declarations for editor workers.
- Created acceptance tests for guardrails with stubs for AT1–AT10.
- Established SCA Failure Catalogue Fixtures for regression testing.
- Developed plugin determinism harness with stubs for PL1–PL10.
- Added scripts for evidence upload and verification processes.

docs/product-advisories/ADVISORY_INDEX.md

@@ -31,6 +31,15 @@ These are the authoritative advisories to reference for implementation:
 - **Gaps:** `31-Nov-2025 FINDINGS.md` (FC1–FC10 remediation task SCA-FIXTURE-GAPS-300-014)
 - **Status:** Captures five real-world regressions/ SBOM gaps for Trivy/Syft/Grype/Snyk and frames test vectors + alarm scenarios for StellaOps acceptance suites.
 
+### Acceptance Tests Pack & Guardrails
+- **Canonical:** `29-Nov-2025 - Acceptance Tests Pack and Guardrails.md`
+- **Sprint:** SPRINT_0300_0001_0001_documentation_process.md (docs tracker)
+- **Related Docs:**
+  - `docs/product-advisories/29-Nov-2025 - Acceptance Tests Pack and Guardrails.md` (this briefing)
+  - `docs/process/acceptance-guardrails-checklist.md`
+- **Gaps:** `31-Nov-2025 FINDINGS.md` (AT1–AT10 remediation task AT-GAPS-300-012)
+- **Status:** Defines deterministic, signed acceptance packs with replay parity checks and CI gating thresholds for admission/VEX/auth flows.
+
 ### Mid-Level .NET Onboarding (Quick Start)
 - **Canonical:** `29-Nov-2025 - StellaOps – Mid-Level .NET Onboarding (Quick Start).md`
 - **Sprint:** SPRINT_0300_0001_0001_documentation_process.md (docs tracker)