Python SDK:
- Fix instance_validator.validate() to call validate_instance() for core validation
- Fix \ property incorrectly treated as additional property violation
- Suppress RuntimeWarning when running via python -m
- Improve CLI with argparse (help, --quiet, --importmap flags)

VS Code extension:
- Add CodeLens provider for schema loading status
- Add showSchemaInfo command
- Add enableCodeLens configuration setting
- Improve validation with status tracking
- Add hasWorkspaceSchema method to schema cache
- Update tests for new features