Cabin CO2 Scrubber Compliance Monitor

Every crewed spacecraft runs the same continuous compliance loop: metabolic CO2 pours into a sealed cabin, a molecular-sieve scrubber pulls it back out bed by bed, and mission control watches the trend against a hard regulatory ceiling. This simulator models that loop directly — a real mole-balance ODE for cabin CO2 driven by crew size and activity level, a two-bed 4BMS-style scrubber whose adsorbing bed saturates and whose desorbing bed regenerates on a tunable cycle, and live NASA SMAC-band compliance tracking with a "time in compliance" audit metric. Push crew size and activity up, or stretch the cycle time until a bed saturates mid-cycle, and watch the cabin drift from PASS into CAUTION and EXCEEDANCE exactly as a real environmental control and life support system (ECLSS) would.