feat: fallback shell tool to auto-execute steps

[pkarw]

Is there a plan for the suggested command line tools to be automatically executed by the tool (after ofc. accepting it by the user?) I mean:

OK, I can run it no problem, but a little bit ux-breaking to switch between the tabs

[grabbou]

Yeah, I think we should just add execSync tool, although prepend it with a notice that it must be always confirmed and let it accept "confirmedByUser" boolean.