address review: switch hive-c0re to hive-jobq-wire's shared parse_states/filter_nodes_by_state, note the generic shape in endpoint docs

hive-c0re/src/job_queue/tests.rs

@@ -1527,60 +1527,6 @@ fn graph_snapshot_states_filters_by_node_state() {
     );
 }
 
-/// One hand-built node, bypassing the scheduler entirely — `filter_nodes_by_state`
-/// is a pure `Vec<GraphNode> -> Vec<GraphNode>` transform, so this exercises it
-/// directly rather than trying (and failing, per this module's own rule) to
-/// drive a live group into a genuinely mixed state through the real queue.
-fn node(id: u64, parent: Option<u64>, state: State) -> GraphNode {
-    GraphNode {
-        id,
-        parent,
-        state,
-        deps: Vec::new(),
-        created_at: Utc::now(),
-        started_at: None,
-        finished_at: None,
-        error: None,
-        payload: hive_jobq_wire::NodePayload {
-            label: id.to_string(),
-            data: serde_json::Value::Null,
-        },
-    }
-}
-
-/// The case `graph_snapshot_states_filters_by_node_state` above can't reach:
-/// a still-live group (root `Running`) holding a mix of already-`Done` and
-/// still-`Pending` steps. Filtering out `Done` must drop exactly the `Done`
-/// node and nothing else — the root and the `Pending` sibling both stay,
-/// even though the root itself isn't in the requested state set.
-#[test]
-fn filter_nodes_by_state_keeps_matching_nodes_from_a_mixed_state_tree() {
-    let nodes = vec![
-        node(1, None, State::Running),    // root: whole group still live
-        node(2, Some(1), State::Done),    // finished step, should be hidden
-        node(3, Some(1), State::Pending), // not-yet-run step, should stay
-    ];
-
-    let mut kept: Vec<u64> =
-        filter_nodes_by_state(nodes.clone(), Some(&[State::Running, State::Pending]))
-            .into_iter()
-            .map(|n| n.id)
-            .collect();
-    kept.sort_unstable();
-    assert_eq!(
-        kept,
-        vec![1, 3],
-        "Done is filtered out even though its still-live parent (root) isn't"
-    );
-
-    let mut unfiltered: Vec<u64> = filter_nodes_by_state(nodes, None)
-        .into_iter()
-        .map(|n| n.id)
-        .collect();
-    unfiltered.sort_unstable();
-    assert_eq!(unfiltered, vec![1, 2, 3], "None is the identity filter");
-}
-
 #[test]
 fn error_truncation_cuts_on_a_char_boundary() {
     // `truncate_error` is a pure `&str -> String`. This used to submit a DAG,