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

src/__Tests/__Libraries/StellaOps.Testing.Coverage/AGENTS.md

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+# AGENTS - Testing.Coverage Library
+
+## Roles
+- Backend engineer: maintain coverage parsing and enforcement helpers.
+- QA / test engineer: verify deterministic coverage calculations and reporting.
+
+## 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/__Tests/__Libraries/StellaOps.Testing.Coverage
+- Used by test suites that enforce coverage thresholds.
+- Avoid cross-module edits unless explicitly noted in the sprint file.
+
+## Determinism and Safety
+- Avoid DateTimeOffset.UtcNow for report timestamps; use explicit values or TimeProvider.
+- Use invariant formatting for coverage percentages and numeric outputs.
+
+## Testing
+- Cover Cobertura parsing, dead-path detection, and exemption matching.