fix: add missing run.sh for x402 human-present scenario

[Ayush10]

Summary

• Add a convenience run.sh script to samples/python/scenarios/a2a/human-present/x402/ that delegates to the existing cards/run.sh with --payment-method x402
• Update the x402 README to reference its own run.sh instead of pointing to cards/run.sh

Closes #107

Test plan

• Verify bash samples/python/scenarios/a2a/human-present/x402/run.sh starts the x402 scenario correctly
• Verify the script delegates to cards/run.sh with the correct --payment-method x402 flag

[gemini-code-assist]

Summary of Changes

Hello @Ayush10, 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 developer experience for the x402 human-present scenario by introducing a dedicated convenience script. This change streamlines the process of initiating the scenario, making it easier for users to get started without needing to remember specific command-line arguments for the underlying generic run script. The accompanying documentation update ensures that users are guided to use this new, simplified method.

Highlights

• New Convenience Script: A run.sh script was added to samples/python/scenarios/a2a/human-present/x402/ to simplify the execution of the x402 human-present scenario by delegating to the existing cards/run.sh with the appropriate payment method flag.
• Documentation Update: The README.md for the x402 scenario was updated to reference the newly added run.sh script, providing a more direct way to start the scenario.

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Changelog

• samples/python/scenarios/a2a/human-present/x402/README.md
  • Updated the example command for running the scenario to point to the new run.sh script.
• samples/python/scenarios/a2a/human-present/x402/run.sh
  • Added a new shell script to act as a wrapper for running the x402 payment method scenario.

Activity

• No human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request introduces a helpful convenience script run.sh for the x402 scenario, simplifying the execution command for users. The accompanying README update is also correct. I've suggested a small improvement to the new script to make it more flexible for future changes.