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

src/Scanner/__Libraries/StellaOps.Scanner.Gate/AGENTS.md

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+# AGENTS - Scanner Gate Library
+
+## Roles
+- Backend engineer: .NET 10 gate policy, DI wiring, configuration, and determinism.
+- QA / bench engineer: tests for policy evaluation, caching, audit logging, and config validation.
+
+## Required Reading
+- docs/README.md
+- docs/07_HIGH_LEVEL_ARCHITECTURE.md
+- docs/modules/platform/architecture-overview.md
+- docs/modules/scanner/architecture.md
+- src/Scanner/AGENTS.md
+- Current sprint file under docs/implplan/SPRINT_*.md
+
+## Working Directory & Boundaries
+- Primary scope: src/Scanner/__Libraries/StellaOps.Scanner.Gate
+- Test scope: src/Scanner/__Tests/StellaOps.Scanner.Gate.Tests (create if missing)
+- Avoid cross-module edits unless explicitly allowed in the sprint file.
+
+## Determinism and Safety
+- Inject TimeProvider and IGuidGenerator; no DateTime.UtcNow or Guid.NewGuid in production code.
+- Use InvariantCulture for parsing/formatting and stable ordering for rule evaluation.
+
+## Testing
+- Cover policy evaluation, options validation, caching behavior, and audit logging.
+- Use deterministic fixtures and fixed time providers in tests.