Fix callback file opening

[sidnarayanan]

Was crashing for me:

  File "/code/ldp/ldp/alg/callbacks.py", line 176, in after_transition
    with Path(self.env_files[traj_id]).open() as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/.local/share/uv/python/cpython-3.12.8-linux-x86_64-gnu/lib/python3.12/pathlib.py", line 1013, in open
    return io.open(self, mode, buffering, encoding, errors, newline)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '/home/sid/aviary_data/sid/seqqa-local-tsft/v4/eval/v1/seqqa_sid-seqqa-local-tsft-v4-training-v1-epoch-5-ckpt_SimpleLocalLLMAgent_0/adcc236a09464241a1512ff0326309d2_env.json'

[jamesbraza]

Wb unit test

[sidnarayanan]

Not worth taking the time right now

[jamesbraza]

Approving but unit test will make it a LGTM

[whitead]

Sorry @jamesbraza @sidnarayanan - stupid refurb told me I couldn't use open(path, 'w') and had to use Path, which I'm less familiar with

[sidnarayanan]

Can we disable refurb? It's too opinionated. These days I end up adding rules to the ignorelist more often than listening to it.