fangchenghao/latex-look

Lets the agent see the compiled page: renders any page to an image, resolves a PDF point or a text anchor to the exact source line through SyncTeX (and says when a rule is drawn by a package rather than by the body, which is where naive locating is wrong), diffs a page against the previous build so an edit is visible, audits every page for holes the edit introduced, and checks that numbered labels still read in order.