Web-researched + adversarially-verified design for extending library.rs with more
store providers: the LibraryProvider extension point, the two cross-cutting pieces
(Windows interactive-session launch wiring + a layered artwork strategy), new
LaunchSpec kinds, per-store enumeration/launch/art recipes with priority/effort/
confidence, a phased plan, and the verification corrections.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
