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/advisories/explorer-integration.md

@@ -0,0 +1,19 @@
+# Advisories Integration with Vuln Explorer (Md.XI draft)
+
+> Status: DRAFT — waiting on export bundle spec + provenance notes; keep TODO.
+
+## Scope
+- Describe advisory normalization, withdrawn handling, provenance, and export bundle linkage for Vuln Explorer.
+- Deterministic examples with hashes in `docs/assets/vuln-explorer/SHA256SUMS`.
+
+## Dependencies
+- Export bundle spec/provenance notes (in progress).
+- GRAP0101 identifiers.
+
+## Outline
+- Advisory ingestion flow and key normalization.
+- Withdrawn/updated advisory handling.
+- Provenance: DSSE/Rekor optional; bundle manifests.
+- Cross-links to findings ledger and VEX decisions.
+
+_Last updated: 2025-12-05 (UTC)_