Restructure solution layout by module

src/Policy/StellaOps.Policy.Engine/AGENTS.md

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+# StellaOps.Policy.Engine — Agent Charter
+
+## Mission
+Stand up the Policy Engine runtime host that evaluates organization policies against SBOM/advisory/VEX inputs with deterministic, replayable results. Deliver the API/worker orchestration, materialization writers, and observability stack described in Epic 2 (Policy Engine v2).
+
+## Scope
+- Minimal API host & background workers for policy runs (full, incremental, simulate).
+- Mongo persistence for `policies`, `policy_runs`, and `effective_finding_*` collections.
+- Change stream listeners and scheduler integration for incremental re-evaluation.
+- Authority integration enforcing new `policy:*` and `effective:write` scopes.
+- Observability: metrics, traces, structured logs, trace sampling.
+
+## Expectations
+- Keep endpoints deterministic, cancellation-aware, and tenant-scoped.
+- Only Policy Engine identity performs writes to effective findings.
+- Coordinate with Concelier/Excititor/Scheduler guilds for linkset joins and orchestration inputs.
+- Update `TASKS.md`, `../../docs/implplan/SPRINTS.md` when status changes.
+- Maintain compliance checklists and schema docs alongside code updates.