Update documentation for first-time users and fix outdated agent names

Major documentation improvements:
- Fixed all outdated agent names throughout README.md and GETTING_STARTED.md
- Updated agent references from old names (todo-keeper, changelog-keeper, setup-repository)
  to new names (keepaTodofile, keepaChangelog, setupRepository)
- Created comprehensive HELLO_WORLD_TUTORIAL.md with step-by-step guide for new users
- Added prominent tutorial links in README.md and GETTING_STARTED.md for better discoverability
- Updated Python version requirements from 3.8 to 3.9 in project templates
- Enhanced first-time user experience with clear guidance and working examples

Documentation now provides:
✅ Working commands that match actual agent names
✅ Clear separation between new users and experienced users
✅ Complete tutorial from installation to running code
✅ Proper guidance for scenario one (greenfield projects)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -11,7 +11,10 @@ This project embraces the Japanese concept of "kaizen" (continuous improvement)
 pip install kaizen-agentic
 ```
 
-### Initialize a New Project
+### Your First Project (New Users)
+**👋 New to Kaizen Agentic?** Follow our [Hello World Tutorial](docs/HELLO_WORLD_TUTORIAL.md) for a complete step-by-step guide.
+
+### Create a Project (Experienced Users)
 ```bash
 # Create a new project with AI agents
 kaizen-agentic init my-project --template python-web
@@ -30,7 +33,7 @@ make help  # See all available commands
 cd your-existing-project
 
 # Install relevant agents
-kaizen-agentic install todo-keeper changelog-keeper tdd-workflow
+kaizen-agentic install keepaTodofile keepaChangelog tdd-workflow
 
 # Check what was installed
 kaizen-agentic status
@@ -48,10 +51,10 @@ kaizen-agentic status
 ## Available Agents
 
 ### Project Management
-- **todo-keeper**: Manages TODO.md files following Keep a Todofile format
-- **changelog-keeper**: Maintains CHANGELOG.md files following Keep a Changelog format
-- **contributing-keeper**: Creates and updates CONTRIBUTING.md files
-- **project-assistant**: General project management and coordination
+- **keepaTodofile**: Manages TODO.md files following Keep a Todofile format
+- **keepaChangelog**: Maintains CHANGELOG.md files following Keep a Changelog format
+- **keepaContributingfile**: Creates and updates CONTRIBUTING.md files
+- **project-management**: General project management and coordination
 
 ### Development Process
 - **tdd-workflow**: Test-driven development workflow guidance
@@ -60,13 +63,13 @@ kaizen-agentic status
 
 ### Code Quality
 - **code-refactoring**: Code improvement and refactoring guidance
-- **agent-optimization**: Agent definition optimization and improvement
+- **optimization**: Agent definition optimization and improvement
 - **datamodel-optimization**: Data model design and optimization
 
 ### Infrastructure
-- **setup-repository**: Repository initialization and standards compliance
+- **setupRepository**: Repository initialization and standards compliance
 - **claude-documentation**: Claude Code configuration and documentation
-- **testing-efficiency**: Testing infrastructure optimization
+- **tooling-optimization**: Repository tooling usage optimization
 
 [View complete agent list](docs/AGENT_DISTRIBUTION.md#agent-categories)