v0.11.0: Run the CLI step of release-check without an absolute cargo target.

A scene can paint a wave as a node. The preset renders in a check with no
GPU, and the same image is what the GPU draws.

Added

• shaders::waves() is a box in the scene. .amp(), .deep() and
  .foam() are signals, and a theme role such as Accent follows the
  theme. .uniform() sets a numeric field of your own shader.
• Shader::source keeps WGSL in the scene. Shader::file reads it on
  every draw, so saving the file updates the picture without a rebuild.
  The text defines Params and shade. oxframe adds ShadeIn. A wrong
  name or type fails the check and lists the fields. WGSL that does not
  compile fails it too, with the line in your source.
• A check paints shader layers at half resolution. An opaque shader over
  text is a warning. A pass over the draft budget is a warning.