more audit work

src/VexLens/__Tests/StellaOps.VexLens.Tests/AGENTS.md

@@ -0,0 +1,22 @@
+# VexLens Tests Charter
+
+## Mission
+Validate consensus, noise-gating, and delta workflows for VexLens.
+
+## Responsibilities
+- Maintain unit tests for consensus, delta reports, and noise gating.
+- Keep fixtures deterministic and offline-friendly.
+- Track sprint tasks in `TASKS.md` and update the sprint tracker.
+
+## Key Paths
+- `Delta/DeltaReportBuilderTests.cs`
+- `NoiseGate/NoiseGateServiceTests.cs`
+
+## Required Reading
+- `docs/modules/vex-lens/architecture.md`
+- `docs/implplan/permament/SPRINT_20251229_049_BE_csproj_audit_maint_tests.md`
+
+## Working Agreement
+- 1. Use fixed TimeProvider in tests.
+- 2. Keep ordering deterministic in assertions.
+- 3. Update `TASKS.md` and sprint statuses when work changes.