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

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

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+# Concelier SchemaEvolution Tests Charter
+
+## Mission
+- Validate schema evolution rules and backward compatibility for Concelier data.
+
+## Responsibilities
+- Exercise schema upgrade paths and compatibility checks.
+- Verify deterministic normalization of schema artifacts.
+
+## 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.
+- Avoid network dependencies in tests.
+- Keep snapshots deterministic and invariant.
+
+## Testing Strategy
+- Unit tests for schema diff and upgrade logic.
+- Regression tests for compatibility guards.