Making-acid/dsh-approval-preflight

Graph-first permission preflight for DSH. The model declares a computation graph whose nodes state the semantic operation (download what to where, write what, delete what); the user approves nodes one at a time in a side panel, one approval covers one successful execution, and each node keeps an audit trail of what actually ran. Uncovered operations still ask through the native approval card, and a node blocked by an unanswered permission is suspended so work that does not depend on it can continue.