I read here ( http://androidlittle.blogspot.com/2009/08/intent-filter-for-share-link.html ) what intent-filter is required to handle the \"share link\" intent that the andro
whoops!
Turns out, I had got the package installed initially but upon reinstallation it was silently failing. In between those two builds I fixed the manifest to be as you see above - the installed version didn't have the intent-filters specified, which obviously wouldn't work.
Guess I'll leave this here in case someone has the same need? Or should I just delete it?