Schwarzschild–de Sitter Exact Solution in the Central Projection Framework

We construct the Schwarzschild–de Sitter metric as the unique spherically symmetric static exact solution of the vacuum Einstein equation derived in Paper [1] of this series. The cosmological constant Lambda = 3/R^2 is intrinsically determined by the central projection framework, requiring no additional assumptions. We examine the R -> 0 limit and connect it to the nested structure of Paper [4].