Part of #579. A units table in fieldcraft-model: Dimension as SI base
exponents, named units with factors (offsets only for absolute °C/°F),
unit expressions (t/mm³, W/(m·K)), Quantity kinds with parsing of
"210 GPa" / {value, unit} under dimension checks, formatting, and display
presets (SI, m-kg-s, mm-t-s-N-MPa, in-lbf-s-psi). Model storage unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo