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/examples/policies/README.md

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+# Policy Examples
+
+Sample `stella-dsl@1` policies illustrating common deployment personas. Each example includes commentary, CLI usage hints, and a compliance checklist.
+
+| Example | Description |
+|---------|-------------|
+| [Baseline](baseline.md) | Balanced production defaults (block critical, respect strong VEX). |
+| [Serverless](serverless.md) | Aggressive blocking for serverless workloads (no High+, pinned base images). |
+| [Internal Only](internal-only.md) | Lenient policy for internal/dev environments with KEV safeguards. |
+
+Policy source files (`*.stella`) live alongside the documentation so you can copy/paste or use `stella policy new --from file://...`.
+
+---
+
+*Last updated: 2025-10-26.*
+