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

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

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+# Concelier ConfigDiff Tests Charter
+
+## Mission
+- Validate config diff behaviors for Concelier configuration surfaces.
+
+## Responsibilities
+- Exercise configuration comparison logic and determinism.
+- Cover edge cases (missing keys, ordering, default values).
+
+## Required Reading
+- docs/README.md
+- docs/07_HIGH_LEVEL_ARCHITECTURE.md
+- docs/modules/platform/architecture-overview.md
+- docs/modules/concelier/architecture.md
+- docs/modules/concelier/link-not-merge-schema.md
+
+## Working Agreement
+- Use fixed times and IDs in tests.
+- Assert deterministic ordering and invariant formatting.
+- Avoid network dependencies in tests.
+
+## Testing Strategy
+- Unit tests for config diff logic and normalization.
+- Regression tests for deterministic output.