[nodivbyzero]

Description

• Table-driven reference checks for inch, foot, mile, pound, gallon, PSI, gravity, temperature, RPM, radians, kWh, and bytes.
  NIST SP 811 and BIPM SI-prefix references.
• Round-trip tests across mass, length, area, volume, temperature, time, speed, pressure, energy, power, angle, frequency, digital, density, resistance, voltage, and current.
• Existing JSON/text fuzz tests remain covered in quantity_test.go