Phase 0 of the op-web-daemon extraction. op-host-native now defaults to a
raster-only library: with the new NON-default gl-host feature off, it pulls no
winit/glutin/jian-host-desktop/accesskit and skia-safe WITHOUT gl (no GL link
directives). GUI consumers (op-host-desktop) opt in via features=[gl-host], so
the future headless op-web-daemon can depend on op-host-native
(default-features=false) for the raster export path without the desktop GUI stack.
- Move NativeFrameBackend widget_host/ -> backend/ (raster; no longer drags the
interactive host into the raster build).
- Gate widget_host/preview/boolean_ops/canvas_view_stub + GlutinProvider /
SharedSkiaContext behind gl-host. skia gl arrives only via skia-safe/gl;
accesskit made optional. Mobile-safe: default features = no gl-host.
Verified: raster + desktop + app build green; 385 lib tests pass under gl-host;
cargo tree confirms the raster build is winit/glutin/skia-gl free. Codex-approved.
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