fix(interpreter): remove exported vars from env on unset#1042
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unset VAR removed the variable from self.variables but not self.env. Since variable lookup falls back to self.env, unset exported variables remained accessible. Now self.env.remove() is called alongside self.variables.remove(). Closes #946
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Summary
unset VARnow also removes the variable fromself.env, not justself.variablesself.env, so exported variables remained accessible afterunsetCloses #946