Abstraction Police

Guard the boundaries. This routine finds where abstractions leak (callers depend on internals the interface shouldn't expose) and where layering is violated (a layer reaches across or up past its allowed dependencies), and restores clean separation — without changing what the app does. Companion to abstraction-improver (which removes too much abstraction; this fixes broken abstraction). Runs daily (once per app) and on demand via /abstraction-police.