BOND COHERENCE LIMIT = |Oh|/2 = 24 (2026-03-27)

Eigsh times: gap=22 (1139s peak), gap=24 (120s clean), gap=26 (HUNG)
24 = |Oh|/2 = number of breather modes = coherence length
Collective enhancement: 646x (breaks down beyond gap=24)

The bond range IS the harmonic range.
The particle spectrum and the bond range are the same number.
