[WIP][examples] fix: use shell to run cmd in sandbox

[ShengDev]

What does this PR do?

During reward calculation, multiple commands are executed. The set -x option is used to echo each executed command to the output; however, by default, these traces are written to stderr. This results in execution outputs being split across stdout and stderr. To ensure correct parsing, all outputs — both command traces and their results — should be merged sequentially as expected.

This PR utilizes shell.run() over command.run() to execute commands in the openYuanrong sandbox, ensuring outputs are returned both sequentially and atomically.

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Test

manuel test is done in remote sandbox system

API and Usage Example

This PR does not change API. It changes the implemention of command execution

Design & Code Changes

This PR utilizes shell.run() over command.run() to execute commands in the openYuanrong sandbox, ensuring outputs are returned both sequentially and atomically.

examples/blackbox_recipes/claude_code/claude_code_runner.py
async def run utilizes shell.run() over command.run()

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