Corgi backend fixes - #850
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Term::Proj lowered to Op::Field unconditionally, but Proj on a List means indexing and Field is product-elimination-only (panicked in value.rs). compile_projection now guards with a total place-shape resolver. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Columns carry exactly one shape; infer_shape_cols/transcode assumed row 0's arity for every row, truncating or panicking depending on row order — worst case a silent wrong answer (distinct over truncated rows invents a row). assert_uniform enforces the contract with a message naming the offending row and the remedy (pad to one arity, or use --backend=vec). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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