fix: remove blocking cleanup from streaming generator

- stream finally froze main thread on cache.task_free
- scheduler handles cleanup in next loop iteration instead

astrai/inference/engine.py

@@ -204,7 +204,6 @@ class InferenceEngine:
 
         def gen():
             nonlocal remaining
-            try:
             while remaining > 0:
                 items = result.pop_all()
                 for idx, token in items:
@@ -216,9 +215,6 @@ class InferenceEngine:
                         yield (idx, token) if is_batch else token
                 if remaining > 0:
                     result.wait(timeout=0.05)
-            finally:
-                for tid in task_ids:
-                    self.scheduler.remove_task(tid)
 
         return gen()