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

src/__Libraries/StellaOps.HybridLogicalClock.Tests/AGENTS.md

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+# AGENTS - HybridLogicalClock Tests
+
+## Roles
+- QA / test engineer: deterministic unit tests for HLC parsing, tick, and state store behavior.
+- Backend engineer: align tests with HLC library contracts.
+
+## 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/__Libraries/StellaOps.HybridLogicalClock.Tests
+- Test target: src/__Libraries/StellaOps.HybridLogicalClock
+- Avoid cross-module edits unless explicitly noted in the sprint file.
+
+## Determinism and Safety
+- Prefer fixed timestamps via FakeTimeProvider.
+- Avoid DateTimeOffset.UtcNow and Guid.NewGuid in test fixtures.
+
+## Testing
+- Cover parse/compare, tick/receive, and state store behavior with edge cases.