refactor(#2591): fix wire-shape consumers (server await_dags, tests)

- server::await_dags: a DAG is settled when gone from the snapshot (fully
  Done) or present with all nodes terminal; pending only with a non-terminal
  node (DagView no longer carries a rolled-up state).
- DagView::rollup_state() added to hive-sh4re — the shared node-set roll-up
  derivation every Rust consumer uses.
- JobQueue::build_log_id_of(node_id) — the node_id -> build_logs lookup the
  query endpoint will use; tests assert log-id via it now.
- tests: derive roll-up state; drop the off-wire step/build_log_id wire asserts.

hive-c0re/src/server.rs

@@ -795,9 +795,14 @@ async fn await_dags(coord: &Arc<Coordinator>, ids: &[u64], timeout: std::time::D
     let deadline = std::time::Instant::now() + timeout;
     loop {
         let snap = coord.job_queue.snapshot();
-        let pending = ids
-            .iter()
-            .any(|id| snap.iter().any(|d| d.id == *id && !d.state.is_terminal()));
+        // A DAG has settled when it's either gone from the snapshot (fully
+        // `Done` DAGs drop out) or still present but with every node terminal
+        // (a `Failed`/`Cancelled` DAG lingers). It's pending only while it has
+        // a non-terminal node.
+        let pending = ids.iter().any(|id| {
+            snap.iter()
+                .any(|d| d.id == *id && d.nodes.iter().any(|n| !n.state.is_terminal()))
+        });
         if !pending {
             return;
         }