`parse_csv` now supports `parse_csv_with_warnings` to detect and report
short rows.
Short rows are now padded with `Value::Null` instead of being silently
dropped.
`ImportJsonHeadless` now uses `parse_csv_with_warnings` and surfaces
warnings in the status message.
`ImportJsonHeadless` now reuses parsed JSON/CSV data via
`json_import_records` instead of re-parsing.
Add regression tests for short row handling and headless import.
Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/gemma-4-26B-A4B-it-GGUF:UD-Q5_K_XL)
Edward Langley
f0b9227d8f