fix: add missing run.sh for x402 scenario

[ayushozha]

Summary

• Add a 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

Fixes #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
• Verify additional arguments are passed through via "$@"

🤖 Generated with Claude Code

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[gemini-code-assist]

Summary of Changes

Hello, 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 streamlines the execution of the x402 payment scenario by introducing a dedicated shell script. This script simplifies the process for users by abstracting away the need to manually specify the payment method, improving the developer experience and reducing potential setup errors. The accompanying documentation has also been updated to reflect this change, ensuring clarity and ease of use.

Highlights

• New run.sh script for x402 scenario: A dedicated run.sh script has been added to samples/python/scenarios/a2a/human-present/x402/. This script acts as a convenience wrapper, delegating to the existing cards/run.sh while automatically applying the --payment-method x402 flag.
• README update for x402 scenario: The README.md for the x402 scenario has been updated to reference the newly added run.sh script, simplifying the instructions for executing the scenario.

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[gemini-code-assist]

Code Review

This pull request correctly adds a convenience run.sh script for the x402 scenario and updates the documentation. My review focuses on improving the robustness of the new script. I've suggested a change to ensure the script works correctly regardless of the directory from which it's run, addressing a potential bug. Otherwise, the changes look good.

[gemini-code-assist]

The cards/run.sh script that is being called expects to be run from the repository root. The current implementation of this wrapper script will fail if it's not executed from the repository root itself (e.g., if a user changes into this directory and runs ./run.sh). This can be fixed by changing the current directory to the repository root before executing the cards/run.sh script.

Additionally, it's good practice to add set -e to the script to ensure it exits immediately if any command fails.

Suggested change

	#!/bin/bash
	# A script to automate the execution of the x402 payment example.
	# This is a convenience wrapper that runs the standard scenario with
	# the x402 payment method.
	SCRIPT_DIR="$(dirname "$0")"
	exec bash "$SCRIPT_DIR/../cards/run.sh" --payment-method x402 "$@"
	#!/bin/bash
	set -e
	# A script to automate the execution of the x402 payment example.
	# This is a convenience wrapper that runs the standard scenario with
	# the x402 payment method.
	# The wrapped script, cards/run.sh, expects to be run from the repository root.
	# To make this script runnable from any directory, we first change to the repo root.
	cd "$(dirname "$0")/../../../../../../"
	exec bash "samples/python/scenarios/a2a/human-present/cards/run.sh" --payment-method x402 "$@"