FICTIONAL INBOX INDEX
M-101 | Workshop agenda.pdf | attachment yes | message size 2 MB
M-102 | Event photos.zip | attachment yes | message size 12 MB
M-103 | Long plain-text digest | attachment no | message size 11 MB
M-104 | Design archive.zip | attachment yes | message size 18 MB
Task: predict matches for has:attachment larger:10M, then review each match before any storage action.