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/30-Nov-2025 - Comparative Evidence Patterns for Stella Ops.md

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+# 30-Nov-2025 · Comparative Evidence Patterns for Stella Ops
+
+**Why now:** UX and data-model decisions need a grounded comparison of evidence/suppression patterns across major vendors.
+
+## Scope
+- Summarise how Snyk, GitHub, Aqua, Anchore/Grype, and Prisma Cloud handle evidence, suppression, audit/export.
+- Feed UX/data-model decisions for VEX, evidence views, and export policies.
+- Drives task 23 (EVIDENCE + suppression pattern sync) in sprint tracker.
+
+## Required artefacts (MVP)
+- This brief plus links to any UI or schema follow-ups once drafted.
+- Sprint tracker row 23 updated when evidence is logged.
+
+## Determinism & Offline
+- Keep examples deterministic; no live API calls in comparisons; cite cached docs/artefacts where needed.
+
+## Next actions
+- Add schema/UX notes to module docs when ready; log completion in Execution Log.