fix: remove accidental itar_experiments logger import

[LemonPi]

Summary

base_experiments/util.py imported logger from itar_experiments.env.env, creating a circular dependency: itar_experiments (and its successor rumi) depend heavily on base_experiments, while base_experiments reached back into itar_experiments solely to grab a module-level logger. git blame shows this was an accidental auto-import introduced in 5549ae4 "Evaluate action error".

Change

-from itar_experiments.env.env import logger
+logger = logging.getLogger(__name__)

(logging is already imported.)

This lets base_experiments be imported in a fresh environment without itar_experiments present — required for the rumi library packaging, which replaces itar_experiments.

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