fmt: cleaned up graph implementation

src/graph/staging.rs

@@ -1,12 +1,6 @@
 use serde_json::Value;
 use std::collections::HashMap;
 
-/// Published form of one branch's writes for the super-step merge phase.
-/// Callers assemble these into a deterministically-ordered `Vec` keyed by
-/// `(node_id, invocation_index)` before passing to
-/// `StateManager::apply_branch_writes`. `invocation_index` is 0 for normal
-/// branches and the input-list position for map sub-branches — so multiple
-/// invocations of the same `branch:` node by a `map` are still totally ordered.
 #[derive(Debug, Clone)]
 pub struct BranchWrites {
     pub node_id: String,