Refactor code structure for improved readability and maintainability; optimize performance in key functions.

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

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+# AGENTS - Scanner Reachability Library
+
+## Mission
+Deliver deterministic reachability analysis, slice generation, and evidence artifacts used by Scanner and downstream policy/VEX workflows.
+
+## Roles
+- Backend engineer (.NET 10, C# preview).
+- QA engineer (unit/integration tests with deterministic fixtures).
+
+## Required Reading
+- `docs/README.md`
+- `docs/07_HIGH_LEVEL_ARCHITECTURE.md`
+- `docs/modules/platform/architecture-overview.md`
+- `docs/modules/scanner/architecture.md`
+- `docs/reachability/DELIVERY_GUIDE.md`
+- `docs/reachability/slice-schema.md`
+- `docs/reachability/replay-verification.md`
+
+## Working Directory & Boundaries
+- Primary scope: `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/`
+- Tests: `src/Scanner/__Tests/StellaOps.Scanner.Reachability.Tests/`
+- Avoid cross-module edits unless explicitly noted in the sprint.
+
+## Determinism & Offline Rules
+- Stable ordering for graphs, slices, and diffs.
+- UTC timestamps only; avoid wall-clock nondeterminism.
+- Offline-first: no external network calls; use CAS and local caches.
+
+## Testing Expectations
+- Add schema validation and round-trip tests for slice artifacts.
+- Ensure deterministic serialization bytes for any DSSE payloads.
+- Run `dotnet test src/Scanner/StellaOps.Scanner.sln` when feasible.
+
+## Workflow
+- Update sprint status on task transitions.
+- Record decisions/risks in sprint Execution Log and Decisions & Risks.