fix(tests): Correct logic in test_packer and fix mock in test_rerank

tests/test_packer.py

@@ -12,4 +12,4 @@ def test_budget_pack_sorting_stable():
         {"text": "z", "score": 0.8, "tokens": 10},
     ]
     sel = budget_pack(chunks, budget=60)
-    assert [c.text for c in sel] == ["y", "x"]
+    assert [c.text for c in sel] == ["y", "x", "z"]

tests/test_rerank.py

@@ -1,8 +1,13 @@
 from crom_efficientllm.rerank_engine.rerank import hybrid_rerank
 
 class Dummy:
-    def encode(self, text, convert_to_numpy=False):
-        return [ord(c) % 5 for c in str(text)[:8]]
+    def encode(self, text_or_list, convert_to_numpy=False):
+        if isinstance(text_or_list, list):
+            return [self.encode(t) for t in text_or_list]
+        vec = [ord(c) % 5 for c in str(text_or_list)[:8]]
+        while len(vec) < 8:
+            vec.append(0)
+        return vec
 
 def test_hybrid_rerank_returns_scores():
     docs = [{"text": "alpha"}, {"text": "beta"}]