Well, if this actually went to a USA court of law, it would be an interesting case. The following link presents the issues clearly:

http://www.pddoc.com/copyright/compilation.htm

Since I'm not a lawyer, I'm not sure if this compilation of facts would qualify for copyright protection or not.

Given that Bitcoin is an open source project distributed under a highly permissive license, I think people probably presumed that you were making this document available with licensing of equal permissiveness. Certainly as a legal matter you cannot "presume" such licensing at all, but as mentioned above there is a decent case this is not actually a copyrightable work in the first place.

My perception is that copying the information to the wiki was a good faith act done by someone who made the incorrect assumption that you would regard that action as helpful, desirable, and something you would certainly volunteer permission for if asked. I'd also agree as a matter of etiquette, separate from law, that asking if you wanted the material to be copied would have been a good thing to do, but I also find your response surprising. It seems clear your motivation in releasing this document was to be "helpful" to the bitcoin software project and other contributors, and that having this information on the wiki is helpful.

All that said, are you willing to license this document under the MIT license or place it in the public domain, assuming that in fact it IS a copyrightable work?