Clamps are physical fixtures that differ between machines, but one global
clamps.json served every machine, so a plasma table and a fiber laser could
not have different rails.
- MachineConfig.Clamps holds each machine's rail in the machine's units,
edited on a new Clamps tab in Tools > Machine Configuration.
- New and BOM import give a nest the rail of the machine they assign;
Nest > Clamps loads and saves the nest's machine's clamps. Each nest keeps
its own copy, so machine edits never move existing nests' clamps.
- At startup, while no machine has clamps, the legacy clamps.json (or the
server's shared copy) is copied once into the default or only machine;
with several machines and no default the user picks one.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>