RSN.11 Resin files: Anycubic Photon Workshop PWMX and PWS (add-on printer-resin-anycubic)

Built in the lab (owner 2026-11-08), our own Apache-2.0 code from a written specification (docs/resin-formats/anycubic-pwmx-SPEC.md), by a builder who saw nothing else. .pwmx (file version 1, optionally 516) and .pws. Options: mirror the picture, file version, edge smoothing, per-layer flag. Not written: versions 517 and 518 (the newer M5 and M7 families). The spec writer measured two public sample files (a .pws and a .pwmx) and found the real files differ from the reference code in three places; the spec records them. Tests pwmx 91/0, browser 38/0. Never loaded on a printer.