Implement parser and CLI with property testing

[TheKnarf]

Summary

• implement additional alignment, distribution, and stacking operators
• add parser for Bluefish-style JSON
• add example scenes and a CLI to render them
• introduce property-based tests with fast-check
• support alignment and direction fields in the parser
• add an example of the Bluefish planet demo
• validate example JSON with scene.schema.json
• use Ajv in the CLI to check scenes before rendering
• new validate all example JSON files against the schema during tests

Testing

• npx biome check --error-on-warnings
• npx tsc --noEmit
• npx vitest run

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https://chatgpt.com/codex/tasks/task_e_68723882e5c08331a0c0a1b9c086a34a