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

src/Authority/__Tests/StellaOps.Authority.ConfigDiff.Tests/AGENTS.md

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+# Authority ConfigDiff Tests Charter
+
+## Mission
+- Maintain deterministic tests for Authority configuration diffing.
+
+## Responsibilities
+- Validate config diff output stability and edge cases.
+- Keep fixtures deterministic and offline-safe.
+
+## Required Reading
+- docs/README.md
+- docs/07_HIGH_LEVEL_ARCHITECTURE.md
+- docs/modules/platform/architecture-overview.md
+- docs/modules/authority/architecture.md
+
+## Definition of Done
+- Tests are deterministic and offline-safe.
+- Coverage includes mismatch detection and ordering behavior.
+
+## Working Agreement
+- Use fixed time and ids in fixtures.
+- Avoid non-deterministic ordering; assert sorted output.