RSN.10 Resin files: Chitubox CTB versions 3, 4 and 5 (in add-on printer-resin-chitu)

Built in the lab (owner 2026-11-08: "build to version 3+"), our own Apache-2.0 code from a written specification (docs/resin-formats/ctb-v3-v5-SPEC.md), by a builder who saw nothing else. Two layouts under one name: plain tables (version 3, 4, 5) and encrypted settings (version 4, 5; AES and SHA-256 through the platform's WebCrypto). Options on the card: layout, version, edge smoothing, projection, layer scrambling. The vendor's disclaimer text is not reproduced (our own 320 bytes: a printer might check it). Which printer needs which layout is not established. The v2 writer's cipher constant is now an option too. Tests ctb3 170/0, incl. the spec's test vectors. Never loaded on a printer.