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- Add enable_semantic_segmentation: bool field with default=True - Allow override via KB_ENABLE_SEMANTIC_SEGMENTATION env var - Pydantic automatically parses boolean strings (true/false, yes/no, 1/0) - Update docstring to document new field CONFIG-01: LLM segmentation can be enabled/disabled via configuration Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>