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

src/__Tests/__Libraries/StellaOps.Testing.Evidence/AGENTS.md

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+# AGENTS - Testing.Evidence Library
+
+## Roles
+- Backend engineer: maintain test evidence storage and hashing.
+- QA / test engineer: validate determinism and summary calculations.
+
+## 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/__Tests/__Libraries/StellaOps.Testing.Evidence
+- Test target: src/__Tests/__Libraries/StellaOps.Testing.Evidence.Tests
+- Avoid cross-module edits unless explicitly noted in the sprint file.
+
+## Determinism and Safety
+- Use canonical JSON or stable ordering for any hash inputs.
+- Avoid nondeterministic timestamps; prefer TimeProvider.
+
+## Testing
+- Cover bundle ID/merkle root determinism and summary grouping behavior.