Add synthetic test dataset

README.md

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+---
+license: cc0-1.0
+tags:
+- synthetic
+- test-data
+size_categories:
+- n<1K
+---
+
+# regular-bench-e8a2fb
+
+Synthetic weather test data: 30 rows in `data.csv`.
+
+All values are randomly generated fictional examples, not real observations, products, or user activity. Intended only for CSV loading and pipeline tests; not suitable for scientific or business conclusions. Columns are sampled independently and do not model real-world correlations.
+
+## Fields
+
+- `sample_id`: random identifier for this generated sample.
+- `row_id`: sequential row number starting at 1.
+- `is_synthetic`: always true.
+- `temperature_c`, `humidity_percent`: simulated values in the units named in each column.

data.csv

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+sample_id,row_id,is_synthetic,temperature_c,humidity_percent
+140ea5ad2dace43b,1,true,14.63,50
+140ea5ad2dace43b,2,true,30.3,18
+140ea5ad2dace43b,3,true,12.97,44
+140ea5ad2dace43b,4,true,4.52,7
+140ea5ad2dace43b,5,true,38.17,43
+140ea5ad2dace43b,6,true,37.15,26
+140ea5ad2dace43b,7,true,38.88,76
+140ea5ad2dace43b,8,true,11.98,32
+140ea5ad2dace43b,9,true,-3.39,55
+140ea5ad2dace43b,10,true,11.47,38
+140ea5ad2dace43b,11,true,18.18,50
+140ea5ad2dace43b,12,true,-3.63,90
+140ea5ad2dace43b,13,true,32.72,86
+140ea5ad2dace43b,14,true,13.45,2
+140ea5ad2dace43b,15,true,34.17,61
+140ea5ad2dace43b,16,true,14.22,16
+140ea5ad2dace43b,17,true,32.33,90
+140ea5ad2dace43b,18,true,3.76,12
+140ea5ad2dace43b,19,true,-6.93,72
+140ea5ad2dace43b,20,true,29.7,70
+140ea5ad2dace43b,21,true,10.22,47
+140ea5ad2dace43b,22,true,34.28,58
+140ea5ad2dace43b,23,true,24.67,47
+140ea5ad2dace43b,24,true,2.46,51
+140ea5ad2dace43b,25,true,28.64,93
+140ea5ad2dace43b,26,true,5.08,62
+140ea5ad2dace43b,27,true,25.43,18
+140ea5ad2dace43b,28,true,17.41,99
+140ea5ad2dace43b,29,true,2.54,55
+140ea5ad2dace43b,30,true,3.15,43