fix(hldp): rank Chinese causal branch queries

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

@@ -48,6 +48,12 @@ test("route returns paths and summaries only, capped at three", () => {
   assert(!JSON.stringify(candidates).includes("A失败"));
 });
 
+test("route ranks a matching Chinese branch instead of treating a sentence as one token", () => {
+  const candidates = route(validTree(), "为什么最终方案发生变化", 3);
+  assert.equal(candidates[0].path, "root/decision");
+  assert(candidates[0].score > 0);
+});
+
 test("read-node reads exactly one bounded node", () => {
   const node = readNode(validTree(), "root/decision");
   assert.equal(node.path, "root/decision");