Fix agent loading and categorization issues

- Fixed YAML frontmatter errors in all agent files causing loading failures
- Added proper category fields to all 16 agents for correct classification
- Standardized agent names to match filenames for consistency
- Updated TODO.md to reflect completed agent system fixes
- Enhanced agents-install-cli make target with pip upgrade and user guidance

All agents now load properly without warnings and display in correct categories:
- Documentation (1), Code Quality (4), Project Management (4)
- Development Process (3), Infrastructure (1), Testing (3)

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

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

Makefile

@@ -705,5 +705,7 @@ agents-status:
 # Install agent distribution CLI
 agents-install-cli: $(VENV)/bin/activate
 	@echo "📦 Installing Kaizen Agentic CLI..."
+	@$(VENV_PIP) install --upgrade pip
 	@$(VENV_PIP) install -e .
-	@echo "✅ CLI installed. Use 'kaizen-agentic --help' for usage."
+	@echo "✅ CLI installed. Use 'kaizen-agentic --help' for usage."
+	@echo "💡 Activate virtual environment with: source $(VENV)/bin/activate"