Fix Python 3 compatibility and logging initialization

[alexhegit]

Summary

Two independent bug fixes:

1. Fix dict.keys() → list() for Omni ArticulationView (simulator/newton/simulator.py)

In Python 3, dict.keys() returns a dict_keys view object, not a list. The Omni API's ArticulationView(include_joints=...) expects an actual sequence type (list/tuple). When _newton_dof_names is non-empty, passing dict.keys() directly causes a TypeError.

Before:

include_joints=self._newton_dof_names.keys(),

After:

include_joints=list(self._newton_dof_names.keys()),

2. Enable logging and faulthandler (train_agent.py)

log.info() and other logging calls were silently dropped because logging.basicConfig() was never called. This made debugging very difficult — all log messages simply vanished with no output.

Added:

import faulthandler
faulthandler.enable()
import logging
logging.basicConfig(level=logging.INFO, format="%(message)s", handlers=[logging.StreamHandler()])

Testing

• Single GPU: Verified Epoch 0–16+ training runs end-to-end with all log output visible
• Multi GPU (4× NVIDIA A30): Same, all 4 ranks log output correctly