feat: Add support for creating dynamic agent cards in the helloworld

[dmandar]

..sample. Also fix some build issues.

[gemini-code-assist]

Summary of Changes

Hello @dmandar, 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 significantly enhances the helloworld agent sample by introducing robust support for dynamic agent cards, allowing for more flexible and illustrative demonstrations of agent capabilities. It also streamlines the agent's configuration through a new command-line interface and includes a minor cleanup of project dependencies.

Highlights

• Dynamic Agent Card Support: Implemented the capability for the helloworld agent to generate dynamic public and extended agent cards. This allows card properties like descriptions and skills to be updated at runtime, demonstrating more advanced agent features.
• Command-Line Configuration: Introduced new command-line options (--dynamic-public-card, --enable-extended-card, --dynamic-extended-card) using the click library. These options provide flexible control over the agent's card behavior, making the sample more configurable for different demonstration scenarios.
• Agent Card Logic Refactoring: Refactored the agent card initialization and handling logic within __main__.py. This includes moving the main execution into a click-enabled function and conditionally applying card modifiers or static extended cards based on command-line arguments.
• Updated Documentation: The README.md has been updated with detailed instructions on how to run the helloworld agent using the new command-line flags, including practical examples for enabling dynamic and extended card functionalities.
• Dependency Cleanup: Removed an unused dotenv dependency from pyproject.toml, addressing a minor build-related issue and streamlining the project's dependencies.

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[gemini-code-assist]

Code Review

This pull request enhances the helloworld agent sample by introducing support for dynamic public and extended agent cards, configurable via new command-line flags. The documentation is updated accordingly, and an unused dependency is removed.

The code changes are well-structured, using click for command-line parsing and dedicated functions for dynamic card generation. My review focuses on improving maintainability and robustness by addressing minor code duplication, adding validation for CLI flags, clarifying the use of a function parameter, and verifying the removal of a dependency. Overall, these are great additions that showcase more advanced features of the A2A protocol.

[holtskinner]

Please add these region tags back, they are used in the public tutorial https://a2a-protocol.org/latest/tutorials/python/3-agent-skills-and-card/#agent-skills