Summary

Sample data in metadata is always returned as JSON string, but some use cases need structured objects or CSV preview format.

Root Cause

Lines 128-129 return JSON.stringify(sampleRows). No option for structured return or original CSV format.

Fix

Add format option: 'json' (current), 'object' (structured array), 'csv' (formatted CSV string), 'markdown' (table). Default to 'object' for programmatic use.

Files Affected

src/lib/utils/csvProcessor.ts

Acceptance Criteria

• Fix implemented and tested
• Unit tests added
• No regressions in existing CSV processing
• Documentation updated if needed

Effort: 1h