partway towards commands

I got very confused and started mucking about with "spawn" when in fact all I needed was the "inline" extension type in orcx that allows the interpreter to expose custom constants.

orchid-api-traits/src/hierarchy.rs

@@ -8,8 +8,8 @@ impl TLBool for TLTrue {}
 pub struct TLFalse;
 impl TLBool for TLFalse {}
 
-/// A type that implements [Hierarchy]. Used to select implementations of traits
-/// on the hierarchy
+/// A type that implements [Extends] or a root. Used to select implementations
+/// of traits on the hierarchy
 pub trait InHierarchy: Clone {
 	/// Indicates that this hierarchy element is a leaf. Leaves can never have
 	/// children