larsandClaude Sonnet 5
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`_row_subsample` hash-filters on `pre_E`, but `build_context`'s prediction branch called it on a frame already projected down to `pred_<var>`/`true_<var>` columns, so any run whose prediction file exceeds `sample_rows` (the default is 1M; real predict outputs can be 100M+ rows) failed with `ColumnNotFoundError: pre_E`. Subsample the full paired frame first, then project — matching every other _row_subsample call site — and restructure the loop to subsample once per prediction side instead of once per paired variable, cutting 6 streaming passes over the prediction file down to 1. Add a regression test with sample_rows below the fixture's row count so the hash-filter branch is actually exercised (the existing test never took it). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qb7xBAa6aAR94AzimgpPxq