Add Policy DSL Validator, Schema Exporter, and Simulation Smoke tools

- Implemented PolicyDslValidator with command-line options for strict mode and JSON output.
- Created PolicySchemaExporter to generate JSON schemas for policy-related models.
- Developed PolicySimulationSmoke tool to validate policy simulations against expected outcomes.
- Added project files and necessary dependencies for each tool.
- Ensured proper error handling and usage instructions across tools.

docs/updates/2025-10-26-scheduler-graph-jobs.md

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+# 2025-10-26 — Scheduler Graph Job DTOs ready for integration
+
+## Summary
+
+SCHED-MODELS-21-001 delivered the new `GraphBuildJob`/`GraphOverlayJob` contracts and SCHED-MODELS-21-002 publishes the accompanying documentation + samples for downstream teams.
+
+Key links:
+
+- Schema doc: `src/StellaOps.Scheduler.Models/docs/SCHED-MODELS-21-001-GRAPH-JOBS.md`
+- Samples (round-trip tested): `samples/api/scheduler/graph-build-job.json`, `samples/api/scheduler/graph-overlay-job.json`
+- Event schema + sample: `docs/events/scheduler.graph.job.completed@1.json`, `docs/events/samples/scheduler.graph.job.completed@1.sample.json`
+- API doc: `src/StellaOps.Scheduler.WebService/docs/SCHED-WEB-21-001-GRAPH-APIS.md`
+- Tests: `StellaOps.Scheduler.Models.Tests/SamplePayloadTests.cs`, `GraphJobStateMachineTests.cs`
+
+## Action items
+
+| Guild | Request | Owner | Target |
+| --- | --- | --- | --- |
+| Scheduler WebService | Wire DTOs into upcoming `/graphs` job APIs (SCHED-WEB-21-001/002). | Scheduler Models Guild | Sprint 21 stand-up |
+| Scheduler Worker | Align planners/executors with `GraphJobStateMachine` and new metadata fields. | Scheduler Models Guild | Sprint 21 stand-up |
+| Cartographer | Confirm expectations for `graphSnapshotId`, `cartographerJobId`, overlay triggers. | Scheduler Models Guild | Cartographer sync 2025-10-27 |
+
+### Notification log
+
+- 2025-10-26 — Posted summary + action items to `#scheduler-guild` and `#cartographer-guild` using the snippet below. Both messages linked back to the schema doc and event sample for follow-up.
+- 2025-10-26 — Shared the API doc link with WebService guild thread for endpoint contract review before Cartographer wiring. Highlighted new `POST /graphs/hooks/completed` + `GET /graphs/overlays/lag` behaviour and correlation IDs.
+
+> Suggested message for Slack `#scheduler-guild` & `#cartographer-guild`:
+>
+> ```
+> Graph job DTOs/docs are live (SCHED-MODELS-21-001/002). Samples under samples/api/scheduler, schema notes in src/StellaOps.Scheduler.Models/docs/SCHED-MODELS-21-001-GRAPH-JOBS.md. Please review before wiring SCHED-WEB-21-001/201. GraphJobStateMachine enforces status/attempt invariants—shout if you need additional states.
+> ```
+
+Record notifications here once posted.