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New concepts/printer-usb-transport.md (the seam, usblp char device, reachability-only status, threat model). open-questions #14: confirm the on-site printer is USB and bake the usblp + udev write-access rule into the appliance image (provisioning, not app code; unverified on hardware). Updated rongta-printer.md (USB transport note), index.md, log.md. Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V