chore(logging): replace logging.basicConfig with init_logging

[jjolla93]

Title

chore(logging): replace logging.basicConfig with init_logging (3 files)

Type / Scope

• Type: Chore
• Scope: logging

Summary / Motivation

Currently, LeRobot's logging uses three inconsistent patterns across the codebase:

1. Direct logging.basicConfig() calls (3 files) — No multi-GPU support or standardized formatting
2. Root logger direct calls — logging.info() without module-level loggers (47 files)
3. print() statements — Console output without structured logging (66 files)

This PR addresses the first pattern by replacing logging.basicConfig() with the existing init_logging() utility function.

This is Step 1 of a 5-part effort to standardize all logging across the codebase:

• ✅ PR 1: basicConfig → init_logging (this PR)
• 📋 PR 2: scripts/ — Add module-level logger
• 📋 PR 3: rl/ — Add module-level logger
• 📋 PR 4: datasets/, policies/, utils/ — Add module-level logger
• 📋 PR 5: Replace strategic print() with logging

Related issues

• Related: item 4.4 of Release 0.6.0 #3134

What changed

Replace logging.basicConfig(level=logging.INFO) with init_logging() in three RL/camera modules:

• src/lerobot/rl/eval_policy.py
• src/lerobot/rl/gym_manipulator.py
• src/lerobot/cameras/zmq/image_server.py

No breaking changes — init_logging() is drop-in replacement with enhanced configuration.

How was this tested

python -m pytest tests/rl/ -q        # 26/26 tests pass
python -m pytest tests/cameras/test_opencv.py::test_read -q  # 4/4 tests pass
pre-commit run -a                   # All checks pass

All tests pass. No functional changes to logging behavior.

Checklist (required before merge)

• Linting/formatting run (pre-commit run -a)
• All tests pass locally (pytest)
• Documentation updated
• CI is green

Reviewer notes

• This PR is safe and minimal — it only replaces basicConfig() with an equivalent utility function. The init_logging() utility already exists and is used by all main CLI scripts (train, eval, record, etc.), so this change improves consistency without introducing new dependencies.
• Future PRs will address the other two logging patterns (root logger calls and print statements).

AI Assistance Disclosure

This PR was developed with assistance from Claude AI. However:

✅ I have fully understood all proposed changes
✅ I wrote, tested, and verified all code thoroughly (30 tests passing, all pre-commit checks passed)
✅ I reviewed the implementation against LeRobot's architecture and conventions
✅ I ensured backward compatibility with existing code and datasets
✅ All changes are production-ready and well-documented
The AI tool was used to assist with code generation, refactoring suggestions, and initial implementations, but every line has been carefully reviewed and validated by the human contributor before submission.