Add synthetic test dataset

README.md

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+---
+license: cc0-1.0
+tags:
+- synthetic
+- test-data
+size_categories:
+- n<1K
+---
+
+# separate-mark-e34c97
+
+Synthetic sensors test data: 33 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.
+- `voltage_v`, `current_ma`: simulated values in the units named in each column.

data.csv

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+sample_id,row_id,is_synthetic,voltage_v,current_ma
+bdaf62dacfa45379,1,true,3.7,72
+bdaf62dacfa45379,2,true,2.909,835
+bdaf62dacfa45379,3,true,1.648,198
+bdaf62dacfa45379,4,true,0.754,576
+bdaf62dacfa45379,5,true,0.653,410
+bdaf62dacfa45379,6,true,1.432,442
+bdaf62dacfa45379,7,true,3.565,167
+bdaf62dacfa45379,8,true,3.241,851
+bdaf62dacfa45379,9,true,1.907,788
+bdaf62dacfa45379,10,true,0.842,873
+bdaf62dacfa45379,11,true,2.494,66
+bdaf62dacfa45379,12,true,4.343,541
+bdaf62dacfa45379,13,true,2.946,899
+bdaf62dacfa45379,14,true,4.574,770
+bdaf62dacfa45379,15,true,2.821,918
+bdaf62dacfa45379,16,true,0.067,872
+bdaf62dacfa45379,17,true,0.38,738
+bdaf62dacfa45379,18,true,1.991,104
+bdaf62dacfa45379,19,true,1.947,535
+bdaf62dacfa45379,20,true,2.815,824
+bdaf62dacfa45379,21,true,1.992,684
+bdaf62dacfa45379,22,true,0.573,34
+bdaf62dacfa45379,23,true,2.108,431
+bdaf62dacfa45379,24,true,2.491,195
+bdaf62dacfa45379,25,true,1.977,95
+bdaf62dacfa45379,26,true,2.154,755
+bdaf62dacfa45379,27,true,3.43,129
+bdaf62dacfa45379,28,true,3.082,761
+bdaf62dacfa45379,29,true,1.603,335
+bdaf62dacfa45379,30,true,4.706,354
+bdaf62dacfa45379,31,true,1.339,147
+bdaf62dacfa45379,32,true,1.754,201
+bdaf62dacfa45379,33,true,2.04,127