At a time when publishers are scrambling to keep customers willing to pay $26 for a hardcover book instead of $9.99 for an electronic version, the publisher of Senator Edward M. Kennedy’s forthcoming memoir is going in the opposite direction - issuing a limited edition it plans to sell for $1,000 a copy. Twelve, an imprint of Grand Central Publishing, is planning to issue 1,000 copies of a leather-bound, electronically signed edition of “True Compass’’ and sell them through the website of Hachette Book Group, the parent company of Grand Central. Although publishers and licensed contractors do occasionally produce collectors’...