Operad v9.0.1

• Added direct app-owned WGPU view composition with explicit load/clear
  behavior, capability reporting, caller-owned GPU timing tokens, and
  discard-path documentation for legacy encoder rendering.
• Added shared font injection for the WGPU renderer and CosmicTextMeasurer
  through a backend-neutral font library so layout and rendered glyphs can use
  the same app fonts.
• Added a public empty resource resolver for rect/text-only render paths and
  documented resolver/update requirements for images, textures, thumbnails, and
  canvas resources.
• Fixed Shader Lab material-effect layout so painted outsets do not overlap
  controls, shortened visible showcase copy, restored canvas demo dragging, and
  added default split-pane drag-handle cross-axis margins.