New 'beat' harness melody (2-bar 104bpm accent map at C1). Six voices built + adversarially judged by a 12-agent workflow, all kept: memkick (tension-modulated Bessel membrane — the pitch drop is emergent physics, punch 9/10), cavikick (Helmholtz port kick, the air side of a drum), implokick (chaotic-collapse feedback FM), wiresnare (emergent wire-contact rattle), cracklesnare (logistic-map spike train, May/Shaw), gransnare (stochastic pulsaret cloud). Verdicts + improvement threads in REPORT.md.