Migrates S3 objects from the old structure to the new multi-lens structure

Normalize a lens name to a valid S3 prefix. Removes spaces, converts to lowercase, removes non-alphanumeric characters.

* Packs n items into a compact grid clustered around `center`, never overlapping * and never leaving `box` (the box keeps the cluster inside its quad

* Process a batch of questions in parallel

* Process multiple files and create a packed project * @param files Array of {filename, buffer, type} objects * @returns PackedProject objec

* Process a zip file and create a packed project with security validations * @param buffer Zip file buffer * @param originalFilename Origina

Process a custom lens. Unlike additional (AWS official) lenses, the PDF is NOT downloaded (admin user uploads it manually). This function

* Safely extracts a ZIP file with security validations * @param buffer The ZIP file as a Buffer * @returns Directory path where files were e

Updates all DynamoDB items to the new multi-lens format