Upstairs Floating-Screed Mass-Spring-Mass Resonance & Footstep Impact (Ln,w) Solver

Deterministic EN ISO 12354-2 mass-spring-mass impact resonance f_0 = 160 * sqrt(s' / m'_screed) + Cremer-Heckl impact sound improvement Delta_L(f) octave integration engine (.pdf, .svg, .json) built for Rockwool, Fermacell, Knauf, Sylomer — zero-upload ephemeral Wasm RAM execution.

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