Final samples update for ConfigLoader top-level key implementation

BREAKING CHANGE: All configuration files now use required top-level keys

Complete samples implementation:
- All configuration files updated to use proper top-level key structure
- Agent configs wrapped in 'agent:' key throughout
- Graph configs wrapped in 'graph:' key throughout
- Swarm configs wrapped in 'swarm:' key throughout
- Tools configs wrapped in 'tools:' key throughout
- All notebooks updated and tested with new ConfigLoader structure

Configuration examples ready for production:
- Schema validation compatible configurations
- Comprehensive tutorial coverage for all ConfigLoader patterns
- Production-ready examples with proper error handling
- Clear migration examples for breaking change
- All nested configurations properly structured

Tutorial coverage includes:
- Basic agent, graph, swarm, and tools configurations
- Advanced patterns: agents-as-tools, graphs-as-tools, swarms-as-tools
- Structured output configurations
- Complex multi-agent orchestration examples
- Configuration-driven development patterns

Ready for immediate use with schema validation and IDE integration support

Author: vawsgit

01-tutorials/01-fundamentals/09-configuration-loader/README.md

@@ -95,10 +95,4 @@ After completing this tutorial, you'll understand how to:
 - Use agents, swarms, and graphs as reusable tools
 - Work with the experimental configuration system
 
-For more advanced topics, explore the other tutorial sections in the samples repository.
-
-## Resources
-
-- [Strands Agents Documentation](https://strandsagents.com/)
-- [Configuration Schema Reference](./SCHEMA-PLAN.md) (experimental)
-- [Schema Validation Guide](./README-schema-validation.md) (experimental)
+For more advanced topics, explore the other tutorial sections in the samples repository.