feat: add DatasetValidator for testset structural and content validation - #52
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Add DatasetValidator class with ValidationResult and ValidationIssue dataclasses. Checks required columns, empty tags, and empty expected_output values. Reports row-level issues with line numbers. 14 unit tests cover all validation paths.
Add DatasetValidator integration to the CLI: - New 'evalwire validate --csv PATH' command reports structural and row-level issues - New '--strict' flag on 'evalwire upload' aborts the upload when validation fails - 7 CLI tests covering valid/invalid CSV, custom column names, and strict mode
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Add DatasetValidator class with ValidationResult and ValidationIssue dataclasses.
Checks required columns, empty tags, and empty expected_output values.
Reports row-level issues with line numbers. 14 unit tests cover all validation paths.