tomoxide-gui 0.6.0

tomoxide desktop GUI (rsplot/egui)
tomoxide-gui-0.6.0 is not a library.

tomoxide-gui — desktop front-end for tomoxide, built on rsplot (egui+wgpu).

Design: docs/GUI.md. Six modes (Data / Tune / Center / Run / Output / Live) behind a left mode rail, with a session log pane and a status bar. M1 implements the offline preview loop (Data, Tune, Center + recipes); Run, Output, and Live are placeholders until M2/M3.