feat: PersistentHugr Walker API

Author: lmondada

hugr-core/Cargo.toml

@@ -26,6 +26,9 @@ bench = false
 [[test]]
 name = "model"
 
+[[test]]
+name = "walker"
+
 [dependencies]
 hugr-model = { version = "0.19.1", path = "../hugr-model" }
 

hugr-core/src/hugr/persistent.rs

@@ -64,6 +64,9 @@
 mod resolver;
 mod state_space;
 mod trait_impls;
+pub mod walker;
+
+pub use walker::{PinnedWire, Walker};
 
 use std::{
     collections::{BTreeSet, HashMap, VecDeque},