julian
7366ad19cb
The ESC/POS printer drivers were TCP-only — every path went through sendRaw/probe to a raw socket on port 9100. Add a USB transport behind the existing render layer without touching a single render*() function. - printer-escpos.ts: sendRawUsb/probeUsb write the same ESC/POS bytes to a kernel usblp char device (/dev/usb/lp0) via a plain fs write — no libusb/CUPS/native dep (keeps MIT-only + minimal-deps appliance). A discriminated Transport + transportFromConfig/sendTo/probeTo dispatch the wire; anything not transport:"usb" is TCP, so existing host-only configs need no migration. Shared transportField/devicePathField config fields. - cashino + rongta resolve a Transport once; both are reachability-only over USB, and the Rongta's HTTP status page degrades to the open-the-node probe over USB (no guessed paper/cover — the standing honesty rule). host/port made not-required so a USB printer needs neither. - Tests: printer-escpos.test.ts (USB writes the exact rendered bytes; probe present/absent; transportFromConfig TCP back-compat) + printer-cashino.test.ts (USB-configured driver prints to the node, ready/offline). USB itself is unverified on hardware (the on-site printers are networked); the appliance-side usblp + udev provisioning is tracked as open-questions #14. Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V