Second-Generation Hilbert Plateau Contract: 3D Inheritance, Typed Zeros, And Shadow-Only Continuity

Foundational — This article, Second-Generation Hilbert Plateau Contract: 3D Inheritance, Typed Zeros, And Shadow-Only Continuity, restates the operational Hilbert room under the later 3D contract so that admissibility is no longer a flat plateau metaphor but a frozen-support, typed-zero, shadow-limited, replayable room with stricter D4/D5/D6 separation. The main contribution is not a new mathematical oracle and not a rewrite of the earlier Hilbert/TWA/TWA+ distinction; it is a reusable contract uplift that preserves the older lineage while making the Hilbert room compatible with later support inheritance, split SoZ pressure, shadow-only bookkeeping, and no-backflow discipline. That makes this more than a local cleanup. It turns the Hilbert room into stronger reusable infrastructure that later room, capsule, promotion, and closure papers can inherit without flattening nulls, laundering shadow into evidence, or silently rewriting support after the fact.