Decimen Optical Transfer v0.5.2 (wire v3)
commit 3c4c864fb139dd2222fc1fada604fccbf0fe620b
https://github.com/bashalarmistalt/decimen-optical-transfer

reference-ts/  encoder files copied verbatim from optic-send/vendor/decimen
               (itself vendored from the commit above; protocol.ts there adds a
               sha256 fallback and gzipIfSupported on top of upstream shared/protocol.ts)
receiver/upstream/  receiver-side files copied verbatim from the commit above:
               shared/{protocol,fountain,optical-error,progress,worker-pool}.ts
               shared/i18n/{messages,registry}.ts (type-only dependency of optical-error.ts)
               (receive/worker.ts is forked into receiver/src/decode-worker.ts, one change noted in its header)
               vendor/decimen-codec/ (decimen-codec v0.2.0 wasm build, zxing-cpp inside)
py/decimen/_vendor/segno  segno 1.6.6, BSD-3-Clause
