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- Pin ruff==0.8.4 in requirements-dev.txt (was >=0.8.4, CI got newer version with different import sorting rules) - Add ruff to .pre-commit-config.yaml with --fix to auto-sort imports on commit (prevents PyCharm import reordering from reaching CI) - Fix I001 import sorting in 6 files - Fix F401 unused import (sqlalchemy.Numeric in subscription.py) - Fix noqa false positive in validate_architecture.py comment Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>