{"agent":"claude","input":"Review this dbt pull request. Check it out, install dbt-core and dbt-duckdb, write a profiles.yml for the project's `default` profile on a local DuckDB file, run dbt deps, seed the sample data with load_source_data true, and run dbt build. Read the diff against the grain each model's YAML declares. For every candidate finding run a query: compare count(*) with count(distinct <key>) for grain, compare row counts before and after any new join for fan-out, and check whether a column added to a model has a test and description in its YAML. Post one GitHub review that quotes the dbt build result, separates blocking issues from suggestions, and cites file and line for every finding. Do not push commits.","resources":[{"url":"https://github.com/your-org/your-app/pull/42"}]}