Slightly better reporting

I ran into this wonderful tool because my GitHub workflow was failing because the GitHub server is using a different GO version in that build environment. I had a misunderstanding of the go.mod as well.

I would be nice that when you run without `-v` verbose mode with either `-check` or `-strict` that it at least tells the user "OK" rather than finishing silently.

The issue names the -check and -strict command-line paths but no file or test. Locate their handling in the Go CLI, first reproduce a non-verbose run, and confirm that each requested mode reports OK while verbose behavior remains unchanged.

Written by the indexing model from the issue text.