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All 600 rows are generated examples, not environmental observations or personal data. Fixed generation seed: 20261027. Independent standard-normal draws define:
treatment = 0.8*x1 - 0.6*x2 + u
outcome = 2*treatment + 1.2*x1 + 0.7*x2 + e
The known partially linear treatment slope is 2. There are 400 training, 100 validation and 100 test rows. group_id provides artificial numeric group labels for testing grouped fold assignment; it is not a real spatial identifier. The public toy manifest records the file hash. Use the causal example configuration through the regression skill. Model output belongs in ignored local results or an authorized external project root, not this read-only fixture directory.