Paper 175B Testing BAO Structure: Reconstruction, Controls, and Uncertainty

A previously developed full-covariance template and projection framework is now used in arecorded matched-window BOSS DR12 comparison, with its actual power measurements, surveywindow, wide-angle response, covariance and calibration–validation split. The pilot chooses amongtwo conditional phase-impulse response families on NGC z1; nonnegative fitted event amplitudes anda measured-space smooth nuisance design are treated separately. Although one searched calibrationscore is large relative to its prescribed Gaussian reference, the smooth-only mean is inadequate andthe frozen SGC z3 validation does not distinguish the oscillatory shapes from dephased envelopes.These results are therefore an executed conditional comparison, not an independent prediction orevidence for an actual Holosphere baryon mechanism. The newly calculated continuously coupledsource produces a different waveform, and must receive a fresh physically specified observationmapping before any later inference. Complete baseline statistical checks and their reproducibilityconventions are retained. An additional offline three-point readiness control tests a conditional nativephase-sign distinction; no new astronomical bispectrum is fitted.