nx_pcb_twin.nx

nx_pcb_twin.nx -- LIB: PCB electrical DIGITAL TWIN. The routed board doesn't just have a topology -- it behaves like a REAL board EXACTLY: real units (mils, oz copper, mA) and real copper physics, in EXACT no-float fixed-point. A trace's RESISTANCE / VOLTAGE-DROP / POWER are computed from the standard copper sheet resistance and pinned to the textbook value (a 10-mil-wide, 1-oz, 1-inch trace = 49.1 mOhm), so the model is provably a twin of reality, not an abstraction. S-class exceed angle: DETERMINISTIC + EXACT (integer; float EDA tools round). Composes the ACTUAL routed geometry from nx_pcb_autoroute (trace length = hops x grid pitch). Games/movies later are a LOOSENED mode on this exact engineering core -- never the reverse. never-brick #26: pure arithmetic, guarded against divide-by-zero, deterministic. license_tier: ORIGINAL