X72-04: Local-Geometry/Nonlocal-Pressure Gap

Continuing from Round 03's STOP-C06, this round directly derives the exact evolution equations for the relational-geometry quantities λ2, det S, and σ, rather than treating them merely as external criteria. Proves that the pressure Hessian H_p is essentially nonlocal at the operator level (its Fourier symbol is non-polynomial and cannot be reconstructed by a local differential operator of any order), so local finite-geometry closure is thereby refuted on the test class; and also proves that the global pairing ∫S:H_p = 0 cannot imply the local spectral sign e_2^⊤H_pe_2 = 0, producing STOP-C07 (the local-geometry/nonlocal-pressure gap) and STOP-C08 (the global-cancellation/local-feedback gap). For the first time on this route, this round establishes a transition finer-grained than continuous/discrete: local continuity is forced by the incompressibility constraint into global, nonlocal continuity (still not discrete), handing off to the next round, which reverses the order of derivation, performing the global projection cancellation first.