Environment and variable

The workspace says which variables exist and how each renders. An environment says what they are worth. Those are two separate files and two separate decisions.

• A declaration is a name plus a type: text, identifier, number, or raw. The type decides the quoting, once, where somebody knew what the value was. A script writes {{schema}}.Audit and gets it right without deciding at every usage site.
• An environment is a column of values. Selecting a different environment changes what the next run substitutes, without touching a script.
• A variable an environment leaves unset substitutes as the SQL keyword NULL, unquoted, whatever its declared type. An undeclared variable is a hard failure instead.

There is one scope. A {{token}} means the same variable in every script in the workspace; there is no project or per-script layer that can shadow it.