refactor: fix command execution and improve script stability

[zkpepe]

Description

cleaned up the script logic so that commands now run with proper stdout/stderr forwarding.
the code is simpler, easier to follow, and more predictable.

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run yarn format and yarn lint without getting any errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes