audit work, fixed StellaOps.sln warnings/errors, fixed tests, sprints work, new advisories

src/__Libraries/StellaOps.Facet/AGENTS.md

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+# AGENTS - Facet Library
+
+## Roles
+- Backend engineer: facet extraction, sealing, drift detection, and VEX draft workflow.
+- QA / test engineer: deterministic fixtures and coverage for extraction and drift workflows.
+
+## Required Reading
+- docs/README.md
+- docs/07_HIGH_LEVEL_ARCHITECTURE.md
+- docs/modules/platform/architecture-overview.md
+- src/__Libraries/AGENTS.md
+- Current sprint file under docs/implplan/SPRINT_*.md
+
+## Working Directory & Boundaries
+- Primary scope: src/__Libraries/StellaOps.Facet
+- Test scope: src/__Libraries/StellaOps.Facet.Tests
+- Avoid cross-module edits unless explicitly noted in the sprint file.
+
+## Determinism and Safety
+- Use TimeProvider and deterministic ordering for hashes, roots, and reports.
+- Validate hash algorithms, limits, and glob patterns before processing.
+- Keep outputs ASCII and stable for hashing/signing workflows.
+
+## Testing
+- Cover extraction ordering, drift calculations, and VEX draft workflow paths.
+- Add negative cases for invalid inputs and boundary conditions.