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The dict-reducer tests were incorrectly removed — they test valid DeltaChannel behavior (dict type inference via Annotated) that was already supported by the base branch's _is_field_channel logic in state.py. The only thing needed was fixing the module name. Also updates all remaining channels._delta imports to channels.delta across state.py and test files. Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>