- Added required validation for bvs_number field in send_plan.php
- Updated form label to show asterisk (*) indicating required field
- Implemented file attachment support in email notifications (multipart MIME)
- Files are now temporarily saved and automatically deleted after email is sent
- Add AJAX handler to ask.md (same as plan.md)
- Improve load_env_file() to strip inline comments and spaces
- Create ERRORS_COLLECTION.md documenting all 7 error categories
- Fixes white page/JSON display issue in ask form