General Relativity and the Identity of Spacetime - Existence, Identity, Topology, Horizons, Energy and Singular Continuation under Dynamical Geometry

La Profilée is the structural law of determinate nature. General relativity realizes its roles through constrained geometry, matter and their joint evolution. This paper retains the seven original general-relativistic questions: spacetime identity, determinate extension, regional energy, horizon roles, topology, collapse and constitutive body identity. We import the Einstein equations and the established domain theorems unchanged and derive the explicit bearer, continuation and verdict architecture used by these questions. The central positive result is Cauchy reconstruction: complete data on any Cauchy surface of one maximal globally hyperbolic development reconstruct that same complete development. On the specified reconstruction carrier, the development-isometry classes are precisely the mutual reconstruction classes. Actual future evolution remains inside such a class; reconstruction does not imply a physically reversible universe. A dust cosmology gives a concrete example of unequal instantaneous geometry belonging to one continuing spacetime. The update establishes an exact joint reduction criterion: constitution, the retained history verdict and actual reduced dynamics must each descend through the proposed description. Flat noncompact and toroidal universes give a global-constitution obstruction; Brown–York energy gives a boundary-data obstruction; Vaidya growth separates marginal and event horizons. A collapse example shows why horizon crossing does not itself destroy a material body. Extendibility, uniqueness and realized selection are distinguished beyond the Cauchy domain. Constitution identifies the addressed whole, Transformation evaluates Q1/Q2a/Q2b, and Coexistence treats its relational wholes. These results strengthen the original GR argument without adding a replacement field equation or selecting a universal physical value.