stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/__Tests/StellaOps.ReachGraph.Cache.Tests/AGENTS.md

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+# StellaOps.ReachGraph.Cache.Tests - Local Agent Charter
+
+## Roles
+- Backend developer
+- QA automation engineer
+
+## Working directory
+- src/__Libraries/__Tests/StellaOps.ReachGraph.Cache.Tests
+
+## Allowed dependencies
+- src/__Libraries/StellaOps.ReachGraph.Cache
+- src/__Libraries/StellaOps.ReachGraph
+- src/__Libraries/StellaOps.TestKit
+
+## Required reading
+- docs/README.md
+- docs/07_HIGH_LEVEL_ARCHITECTURE.md
+- docs/modules/platform/architecture-overview.md
+- docs/modules/reach-graph/README.md
+- docs/modules/reach-graph/architecture.md
+
+## Determinism and test rules
+- Use deterministic inputs: avoid DateTime.UtcNow, DateTimeOffset.UtcNow, Guid.NewGuid, and Random.Shared in tests.
+- Use TimeProvider and fixed seeds or fixtures for time- and randomness-dependent tests.
+- Use CultureInfo.InvariantCulture for parsing and formatting in tests.
+- Tag tests with TestCategories (Unit, Integration, Performance) and keep integration tests out of unit-only runs.
+- Keep tests offline and deterministic; prefer TestServer/TestHost with fixed inputs.
+
+## Quality and safety
+- ASCII-only strings and comments unless explicitly justified.
+- Clean up temp files/directories created during tests.