Paper T16: Coherence Ignition and Amplitude Acceptance in the Holosphere Lattice Low-Amplitude Seeding as a Structural Pathway to High-Amplitude Phase Propagation

Holosphere Theory treats propagation as thresholded coherence transport on a rotating angular lattice. This paper adds an initiation layer: a deterministic coherence-ignition mechanism that decides whether an injected disturbance is extinguished or ramps into sustained, high-acceptance propagation. Ignition is governed by an amplitude-coupled admissibility rule: for fixed misalignment, low-amplitude inputs are preferentially admitted because they impose smaller per-hop strain load and survive across a larger corridor ensemble. Accepted low-amplitude inputs act as alignment catalysts, reducing the internal misalignment state and increasing future admissibility, producing priming, hysteresis, and a sharp phase boundary in (a0,ε0)(a_0,\varepsilon_0)(a0,ε0) space. A turnkey, audit-grade Model 1 demonstrates (i) an ignition phase boundary, (ii) priming gain localized to the boundary rather than a global bias, and (iii) a direct strain-history witness showing state change prior to triggering. Field-like behavior is treated as a consequence of entering the high-acceptance regime, while suppression and decoherence correspond operationally to sustained failure to maintain admissibility in high-strain zones. The paper defines KPI-level observables (ignition probability, delay, headroom, occupancy, and strain-history witnesses) and lays out low-DoF extensions for corridor chains and detector boundary conditions within the T16 series.