Spectral Morphogenesis: A Stateful Spectral Dynamical System over Harmonic-Index Space

A real-time spectral effect maintaining an internal reaction-diffusion-drift state over harmonic-index space, converted to a bounded voice (S_{t+1}=Phi(S_t,X_t), Y=Psi(S)). Third in a sequence (Harmonic Shell Model = structure; Emission Cascade = voice; this = dynamics). Reaction-diffusion sound synthesis is established prior art (Martin 1996; Serquera & Miranda 2008; REAGENTE 2026); the claim is the specific coupling: RD+drift over a harmonic-index/dyadic-shell substrate, input-conditioned, with bounded resonant read-out. Includes the Morphogen implementation, an audit, and a quantitative field characterisation (liveness, spectral motion, spatial organisation, boundedness). No AI; bounded-at-source (no limiter).