geom/ops: add stub 'covers' test

geom/ops.hpp

@@ -28,6 +28,16 @@ namespace cruft::geom {
     bool
     intersects (A<S,T>, B<S,T>);
 
+    /// Tests whether the entirety of shape `B` is inclusively contained
+    /// within the shape `A`.
+    template <
+        size_t S,
+        typename T,
+        template<size_t,typename> class A,
+        template<size_t,typename> class B
+    >
+    bool covers (A<S,T> const&, B<S,T> const&);
+
 
     /// Returns a minimum squared distance between two shapes.
     template <