This is an executable skeleton skill.

Included as real code:
- base workbook selection
- CSV normalization
- workbook write/update
- history enrichment for I/J/M
- filename generation
- state update
- basic validation

Left as placeholders/procedural browser steps:
- BUYMA login and browsing
- BUYMA memo editing
- BUYMA CSV click-flow
- Chrome translated product-name extraction
- Naver Mail sending
- Telegram fallback send
