Fix CLI exit code for invalid bytecode input

[viktorking7]

Description

Problem: The revme bytecode command was returning exit code 0 (success) even when provided with invalid hex input or unsupported EOF bytecode, making it impossible for scripts/CI to detect input validation failures.

Solution:

• Modified bytecode::Cmd::run() to return Result<(), Error> instead of ()
• Return proper errors for invalid hex strings and EOF bytecode instead of silent success
• Propagate errors through MainCmd::run() to ensure non-zero exit codes

Impact:

• revme bytecode <invalid_hex> now correctly returns exit code 1
• Improves CLI reliability for automation and CI pipelines
• Maintains backward compatibility for valid inputs

[codspeed-hq]

CodSpeed Performance Report

Merging #2968 will not alter performance

_{Comparing viktorking7:main (232d775) with main (60f06c0)}

Summary

✅ 173 untouched