Operation-measurement definitions for library step templates. The
input_type selection covers Steelhead's input shapes (text, number,
boolean, selection, date, signature, time_hms, time_seconds,
temperature, thickness, pass_fail).
target_min/max + target_unit are structured (not embedded in the name
string the way Steelhead does it) so the traveller report can render
target vs actual side-by-side and colour-code out-of-range values.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>