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 - Ecosystem Reality Test Cases for StellaOps.md

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+# 30-Nov-2025 · Ecosystem Reality Test Cases for StellaOps
+
+**Why now:** Real incidents (credential leak, offline DB schema mismatch, SBOM parity drift, scanner instability) must translate into deterministic acceptance tests.
+
+## Scope
+- Document the five incidents and expected signals.
+- Map each to acceptance tests and fixture paths (`tests/fixtures/sca/catalogue/`).
+- Drives ECOSYS-FIXTURES-GAPS-300-017 (ET1–ET10).
+
+## Required artefacts (MVP)
+- This advisory plus fixture root path and acceptance test references.
+- Sprint tracker row 21 updated when evidence lands.
+
+## Determinism & Offline
+- Fixtures must pin tool versions and feeds; no live network.
+
+## Next actions
+- Populate fixtures and acceptance specs; log in sprint Execution Log when added.