Now that’s teamwork. Google is indexing LitKicks again, after John Honeck and a few other experts pitched in with helpful advice. It turns out the reason I couldn’t see the spam links is that they were programmed to appear only in response to page requests from Google or other major search engines. The secret was to look at a cached LitKicks page from another search engine, which clearly showed the spam. Thanks also to Google for quickly restoring the site once the problem was solved.
As to how the spam device got there in the first place, it turns out to have been embedded in the WordPress theme I’d used to create the latest version of the site. The theme is called “Royaline”, and anybody else who uses this theme will probably eventually run into the same problem I had. I posted about this on a WordPress forum.
It’s a discouraging fact that prescription drug spammers would so carelessly violate the trust of the open source community. But it’s equally encouraging that I asked for help with this problem and so quickly got what I needed. Good work, people.