*Restrict External Position Removal

This policy exists to protect against a delegated trader removing an external position vault such that it is no longer being accounted for. This can create incorrect valuation of vaults and we recommend reading about the risks this causes in the risks & nuances section.

The policy prevents the removal of an external position from the vault's accounting unless a) it does not have a valid price, or b) its value can be considered negligible (i.e. dust). The dust threshold is maintained by the Enzyme Council.