Unify candidate ranking pipeline

crates/aether-scheduler-core/src/ranking/format.rs

@@ -0,0 +1,12 @@
+use std::cmp::Ordering;
+
+use super::types::SchedulerRankableCandidate;
+
+pub fn compare_format_state(
+    left: &SchedulerRankableCandidate,
+    right: &SchedulerRankableCandidate,
+) -> Ordering {
+    left.demote_cross_format
+        .cmp(&right.demote_cross_format)
+        .then(left.format_preference.cmp(&right.format_preference))
+}