Sell Buildings

Selling owned buildings back for a partial refund, Cookie Clicker style.

Why not: In a game with no building caps or run constraints, selling is never the right move — it only exists in Cookie Clicker to service mechanics we don't have (ascension math, seasonal switches). It adds refund-rate balance questions and stats ambiguity (producedValue of sold units) for a button nobody should press. Reconsider only as part of a prestige design if that ever lands.