Reef & Planted Sump Blackout Back-Siphon & Blocked-Weir Flood-Liter Guard

Deterministic Dual-fault volume invariance: V_drainback(weir_crest + nozzle_siphon + pipe_holdup) < V_sump_freeboard AND V_return_compartment < V_display_rim_headroom engine (.svg, .pdf, .dxf, .json) built for Red Sea, Neptune Apex, Ecotech Marine, Royal Exclusiv — zero-upload ephemeral Wasm RAM execution.

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