fix(hldp): rank Chinese causal branch queries

server-tools/codex-hldp-recursive-memory/hldp-memory.mjs

@@ -56,7 +56,18 @@ export function verifyTree(tree) {
 }
 
 function terms(query) {
-  return [...new Set(query.toLowerCase().match(/[\p{L}\p{N}_-]+/gu) ?? [])];
+  const raw = query.toLowerCase().match(/[\p{L}\p{N}_-]+/gu) ?? [];
+  const expanded = [];
+  for (const token of raw) {
+    expanded.push(token);
+    const characters = [...token];
+    if (/\p{Script=Han}/u.test(token) && characters.length > 1) {
+      for (let i = 0; i < characters.length - 1; i += 1) {
+        expanded.push(characters.slice(i, i + 2).join(""));
+      }
+    }
+  }
+  return [...new Set(expanded)];
 }
 
 export function route(tree, query, max = 3, from = tree.root) {