Trace doesn't work with python 3.13

Trace seems to have some error with the bundle decorator when running on python 3.13. Downgrading to 3.12 does not have this error.

Traceback (most recent call last):
File "/Users/ryanrong/Documents/GitHub/cs224n_llm_agent/pong_LLM_agent.py", line 269, in
rewards = optimize_policy(
env_name="ALE/Pong-v5",
...<4 lines>...
model="gpt-4o-mini"
)
File "/Users/ryanrong/Documents/GitHub/cs224n_llm_agent/pong_LLM_agent.py", line 169, in optimize_policy
@trace.bundle(trainable=True)
~~~~^^^^^^^^^^^^^^^^
File "/Users/ryanrong/.pyenv/versions/3.13.1/lib/python3.13/site-packages/opto/trace/bundle.py", line 57, in decorator
fun_module = FunModule(
fun=fun,
...<7 lines>...
_ldict=prev_f_locals, # Get the locals of the calling function
)
File "/Users/ryanrong/.pyenv/versions/3.13.1/lib/python3.13/site-packages/opto/trace/bundle.py", line 114, in init
assert _ldict is None or isinstance(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ldict, dict
^^^^^^^^^^^^
), "_ldict must be a dictionary. or None"
^
AssertionError: _ldict must be a dictionary. or None

Reproduce the failure from pong_LLM_agent.py in optimize_policy, focusing on the @trace.bundle(trainable=True) entry point. Inspect opto/trace/bundle.py around decorator and FunModule initialization, then verify that the call works on Python 3.13 without regressing Python 3.12 behavior.