Restructure solution layout by module

src/Orchestrator/StellaOps.Orchestrator/AGENTS.md

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+# StellaOps Orchestrator Service — Agent Charter
+
+## Mission
+Build and operate the Source & Job Orchestrator control plane described in Epic 9. Own scheduler, job state persistence, rate limiting, audit/provenance exports, and realtime streaming APIs while respecting the imposed rule: work of this type must be applied everywhere it belongs.
+
+## Key Responsibilities
+- Maintain deterministic Postgres schema/migrations for sources, runs, jobs, dag edges, artifacts, quotas, and schedules.
+- Implement DAG planner, token-bucket rate limiting, watermark/backfill manager, dead-letter replay, and horizontal scale guards.
+- Publish REST + WebSocket/SSE APIs powering Console/CLI, capture audit trails, and guard tenant isolation/RBAC scopes.
+- Coordinate with Worker SDK, Concelier, Excititor, SBOM, Policy, VEX Lens, Findings Ledger, Authority, Console, CLI, DevOps, and Docs teams to keep integrations in sync.
+
+## Module Layout
+- `StellaOps.Orchestrator.Core/` — scheduler primitives, DAG models, rate limit policies.
+- `StellaOps.Orchestrator.Infrastructure/` — Postgres DAL, queue integrations, telemetry shims.
+- `StellaOps.Orchestrator.WebService/` — control-plane APIs (sources, runs, jobs, streams).
+- `StellaOps.Orchestrator.Worker/` — execution coordinator / lease manager loops.
+- `StellaOps.Orchestrator.Tests/` — unit tests for core/infrastructure concerns.
+- `StellaOps.Orchestrator.sln` — solution bundling orchestrator components.