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Alphabetize HeadTrainingRun in models/__init__ + maintenance imports (H before I), and drop the inline comment that split heads.py's import block. Pure import ordering — no behavior change. (run 1601 lint) Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Ttrj5P7upUTueSfoJcxEqa