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

src/Scanner/__Libraries/StellaOps.Scanner.MaterialChanges/AGENTS.md

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+# AGENTS - Scanner.MaterialChanges Library
+
+## Roles
+- Backend engineer: maintain material change orchestration and card generation.
+- QA / test engineer: validate deterministic report outputs and ordering.
+
+## Required Reading
+- docs/README.md
+- docs/07_HIGH_LEVEL_ARCHITECTURE.md
+- docs/modules/platform/architecture-overview.md
+- docs/modules/scanner/architecture.md
+- src/Scanner/AGENTS.md
+- Current sprint file under docs/implplan/SPRINT_*.md
+
+## Working Directory & Boundaries
+- Primary scope: src/Scanner/__Libraries/StellaOps.Scanner.MaterialChanges
+- Related tests: src/Scanner/__Tests/StellaOps.Scanner.MaterialChanges.Tests
+- Avoid cross-module edits unless explicitly noted in the sprint file.
+
+## Determinism and Safety
+- Ensure report ordering and hashes are deterministic (stable sort, canonical inputs).
+- Avoid culture-sensitive comparisons when mapping severity or kinds.
+
+## Testing
+- Cover report ID determinism, summary aggregation, and option handling.