DCRP63 / X72R46: Axial Pressure Oscillation and Floquet Stretch Modulation

Building on the X∨T dichotomy DCRP62 converged to, this round compares the two and chooses to attack X first: the reasoning is that DCRP62 supplied a 'signed axial pressure-response identity' absent from X72's older general defect theory, whereas the T branch, although able to coexist with DCRP31's inward PFET inside the same finite-gauge package, lacks any new signed algebraic relation and its energy/dissipation remains merely critically summable. Under the turnover-free eigen-aligned setup inherited from DCRP61 and DCRP62 (B=ρI, SΩ=λΩ, R_B^tr=0), this round derives Z'/Z=2(λ−λ*) and the proper pressure-defect formula, proving that an aligned pressure defect taken at exactly the neutral rate cannot sustain both 'eigen-alignment' and 'the X72 constant-commutator null channel' for free: the quantified commutation law forces the system to produce either a spatial pressure-defect oscillation or a large temporal Floquet stretch overshoot (λ<0 or λ>2−3γ), and at the exact neutral rate the spatial oscillation is unavoidable. STOP-D63 compresses the X branch into two sub-normal-forms, X_osc and X_mod, and hands to DCRP64/X72-R47 the task of a rigidity analysis focused on the Floquet modulation overshoot.