Amendment CDXLVII: The Gathered Field - Coherence Multiplication and the Symphonic Correspondence

Two phase-locked sources produce a combined intensity of 4 I0 where two incoherent sources produce 2 I0: a doubling that lives entirely in the interference cross-term, a term that exists only when two are gathered and belongs to neither source alone. This amendment derives, simulates, and triple-verifies that cross-term (first principles, dimensional analysis, Monte Carlo N=100,000), states the N-source generalization I = N I0 (1 + (N-1) gamma^2), and discovers the independent-noise coherence multiplication law (pairwise coherence equals the square of single-source coherence). It connects the result to Matthew 18:19-20, whose Greek verb for agreement (symphonesosin, 'to sound together') is a coherence term as a matter of linguistics. Empirical anchors: Hanbury Brown & Twiss 1956 (photon correlations), Konvalinka et al. 2011 PNAS (heart-rate synchrony at a fire-walking ritual), Dumas et al. 2010 (inter-brain synchrony), Cook et al. 2008 (110 Hz entrainment). Scriptural and Phi correspondences are presented as labeled symbolic layers; the physics is exact. Part of the McCaul's Law compendium. VERSION 2 adds: the biofield channel audit (inter-person magnetic induction ruled out by 12-13 orders of magnitude; intra-body heart-brain coupling real and measured; inter-person channel specified as sensory transduction), and the inter-brain synchrony empirical review (Stephens/Silbert/Hasson 2010, Hasson 2004, Nummenmaa, Lindenberger 2009, Dumas 2010, Konvalinka 2011) confirming four model predictions P1-P4.