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Second stage of the zipped project file (#1440): QetContainer::split() turns a project document into the entries of a .qetz -- mimetype first and stored, a manifest with the format and the oldest format allowed to read it, project.xml with each part replaced by <qetz-part file=.../>, one file per folio, per symbol definition and per title block template, and folio pictures as PNG files named by their SHA-256, stored once each. join() puts it back and refuses a file of a later format, a missing part or anything that is not a .qetz. A picture leaves its folio only if its base64 comes back exactly, so nothing here can change a project. Parts are written as QET writes a .qet and read as it reads one. Still nothing opens or saves a .qetz. Test: tst_qetcontainer, every example split, zipped, unzipped and joined back to the same document (whitespace between elements aside); pictures out of the folios once each; later format and missing part refused. With QET_CONTAINER_CORPUS it also runs on a folder of projects: 341 of 341 readable projects collected from the bugtracker, GitHub and the forum come back the same. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019Wga9B92BNurDEtxxtCDxf