Attachment Janitor

Clean up and organize attachments in the Obsidian vault. Two jobs:

1. Find and delete unreferenced attachments
2. Rename referenced attachments with consistent, searchable names

Naming convention

YYYY-MM-DD description.ext

• Date prefix: from the referencing note's filename. Extract the YYYY-MM-DD portion only (ignore time like 1230 in 2026-03-09 1230 ...)
• Description: short English kebab-case phrase describing what the attachment is, based on the embedding context in the note. Keep it under 5 words.
• Extension: preserved from original

When the same note embeds multiple attachments, differentiate by what each one depicts, not by index number. Read the surrounding text to understand each attachment's role.