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

src/__Libraries/__Tests/StellaOps.Eventing.Tests/AGENTS.md

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+# Eventing Tests Charter
+
+## Mission
+- Verify eventing envelope contracts and deterministic serialization.
+
+## Responsibilities
+- Cover schema validation, parsing, and round-trip serialization.
+- Exercise edge cases and determinism behavior.
+
+## Required Reading
+- docs/README.md
+- docs/07_HIGH_LEVEL_ARCHITECTURE.md
+- docs/modules/platform/architecture-overview.md
+- docs/modules/eventing/event-envelope-schema.md
+
+## Working Agreement
+- Use fixed times and IDs for deterministic tests.
+- Avoid network dependencies in tests.
+
+## Testing Strategy
+- Unit tests for schema and serialization.
+- Regression tests for envelope compatibility.