feat: add display_name support and rebrand langgraph as custom_a2a

[eliasecchig]

Summary

• Add display_name field support for agent templates
• Rebrand langgraph template as "custom_a2a" for better discoverability
• Add aliases for backward compatibility

Changes

• templateconfig.yaml: Added display_name: "custom_a2a" and updated description to "Bring your own framework, A2A-ready"
• create.py: Use display_name when available in agent selection menu; changed group header from "🦜 Python (LangGraph)" to "🐍 Python (A2A)"
• list.py: Use display_name when available in agent list table
• template.py: Added custom and custom_a2a aliases pointing to langgraph; extract display_name from config

Rationale

The langgraph template serves as a "bring your own framework" option. Rebranding it as custom_a2a makes this purpose clearer while maintaining backward compatibility through aliases.

[gemini-code-assist]

Summary of Changes

Hello @eliasecchig, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the agent template system by introducing a dedicated display_name field, which improves the clarity and user experience within the command-line interface. A significant part of this change involves rebranding the langgraph template to custom_a2a to more accurately convey its function as a flexible framework integration point, while also ensuring seamless backward compatibility through the implementation of aliases.

Highlights

• Display Name Support: Introduced a new display_name field for agent templates, allowing for more descriptive and user-friendly names in CLI outputs.
• LangGraph Rebranding: The langgraph agent template has been rebranded to custom_a2a to better reflect its purpose as a 'bring your own framework' option for A2A (Agent-to-Agent) interactions.
• Backward Compatibility and Aliases: Added custom and custom_a2a as aliases for the langgraph template, ensuring existing configurations and commands continue to function without disruption.
• CLI Output Enhancements: Updated the agent selection menu and listing table in the CLI to utilize the new display_name for improved readability and clarity, and changed the group header for Python A2A agents.

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[gemini-code-assist]

Code Review

This pull request introduces support for a display_name for agent templates and rebrands the langgraph template to custom_a2a for better discoverability. The changes are consistently applied across the CLI commands for creating and listing agents, as well as in the template utility functions. Aliases have been added for backward compatibility.

The implementation is solid. I've made one suggestion in create.py to dynamically calculate the padding for agent names in the selection menu. This will make the UI more robust against longer display names in the future.

Overall, this is a good enhancement that improves user experience and template organization.