Runnable SearchQA splits should remain disjoint. A duplicate manifest id across train, val, or test previously collapsed into the wanted-id set and reused the same row in multiple output splits without warning.
Constraint: Preserve manifest order and output schema for valid manifests.
Rejected: Deduplicate automatically | hiding split overlap would make evaluation contamination harder to notice.
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Fail fast on split-manifest integrity problems instead of repairing them silently.
Tested: uv run --with pytest pytest tests/test_materialize_searchqa.py -q
Tested: uv run --with ruff ruff check scripts/materialize_searchqa.py tests/test_materialize_searchqa.py
Not-tested: Loading the live Hugging Face dataset.
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