X72-17: Level-Surface Hodge Coherence

Continuing from Round 16's STOP-C20 (boundary-flux gap), this round uses the nonlinear critical gauge div(r²n)=0 to split the level-surface flux B_Q(λ) into continuous surface invariants — normal-alignment angle, mean curvature, and tangential gauge slope — testing whether it is an independent obstruction or can be folded back into the global Hodge geometry. It proves a zero-net normal-alignment identity and an alignment-angle dissipation tax, and obtains the Level Hodge-Coherence Identity: E_M^u/D_M=(√R_M-1)²+2√R_M(1-ρ_M), which lets the accumulated flux be continuously re-integrated back into global coherence, converting it into a new critical weighted physical-gradient carrying quantity E_M — whose finiteness under space-time integration would control Q. This round explicitly states that this is still not closure (the source text devotes a dedicated section to 'Why this is not yet closure'), and halts at STOP-C21 (level-surface Hodge coherence / critical weighted-gradient gap), passing the baton to the next round to decompose E_M back into strain-vorticity geometry.