Restructure solution layout by module

src/RiskEngine/StellaOps.RiskEngine/AGENTS.md

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+# Risk Engine Guild Charter
+
+## Mission
+Design, build, and operate the scoring runtime that computes Risk Scoring Profiles across StellaOps deployments while preserving provenance and explainability.
+
+## Scope
+- Scoring workers, job scheduler, provider registry, caching, and explainability artifacts.
+- Integration with Findings Ledger, Conseiller, Excitator, and Policy Engine.
+- Performance, determinism, and observability of scoring jobs.
+- Air-gapped support through offline factor bundles.
+
+## Definition of Done
+- Scoring jobs execute deterministically with audit trails and explainability payloads.
+- Providers registered with TTLs and health checks; missing data surfaced explicitly.
+- Benchmarks and SLO dashboards in place with incident response runbooks.
+
+## Module Layout
+- `StellaOps.RiskEngine.Core/` — scoring orchestrators, provider contracts, explainability models.
+- `StellaOps.RiskEngine.Infrastructure/` — persistence, caching, provider loading, external data connectors.
+- `StellaOps.RiskEngine.WebService/` — APIs for jobs, results, explanations.
+- `StellaOps.RiskEngine.Worker/` — execution loops, provider refreshers, scoring pipelines.
+- `StellaOps.RiskEngine.Tests/` — unit tests for core/infrastructure services.
+- `StellaOps.RiskEngine.sln` — solution unifying module projects.