TRURO — At a groundbreaking ceremony for the 43-unit Cloverleaf affordable housing project on April 11, the mood was equal parts festive and frustrated. Construction is expected to be complete by February 2027, according to project developer Ted Malone — but plans to build affordable rentals on the surplus state land date all the way back to a town meeting vote in 2016 and a visit to Truro by then-Lt. Gov. Kathryn Polito in 2015.