RS-485 Modbus Topology Reflection, Bias & CRC-Error Solver

Deterministic Transmission-line signal rise-time stub limit (L_stub < t_r * v_p / 10) + Thevenin fail-safe idle bias (>200 mV) engine (.json, .svg, .pdf) built for Wiren Board, Waveshare, Eastron, Vaillant — zero-upload ephemeral Wasm RAM execution.

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