Function run_capture 

pub fn run_capture(program: &str, args: &[&str]) -> Result<String, CommandError>

What: Run a command via SystemCommandRunner and capture stdout as UTF-8.

Inputs:

• program: Executable name to run (for example, "pacman").
• args: Slice of positional arguments passed to the executable.

Output:

• Ok(String) containing UTF-8 stdout on success.
• Err(CommandError) when spawning fails, the command exits non-zero, or stdout is not valid UTF-8.

Errors

• Returns Err(CommandError::Io) when command spawning or execution fails
• Returns Err(CommandError::Utf8) when stdout cannot be decoded as UTF-8
• Returns Err(CommandError::Failed) when the command exits with a non-zero status

Details:

• Thin convenience wrapper around SystemCommandRunner::run; use the trait directly when dependency injection is needed for testing.