AbstractFramework 0.9.3

Fixed

• Pins abstractcore 2.23.1: on the in-gateway MLX lane the prefix cache is sized to the machine
  (min(8 GiB, working set / 4) with a 512 MiB reserve), so a 24 GB Mac running Qwen3.8-27B keeps
  the conversation warm instead of re-prefilling it every turn; and a text route with no
  speculation key inherits optional MTP on a verified MTP model (only "Off" turns it off), which
  restores speculative decoding where a console save had dropped the key.
• Pins abstractgateway 0.11.2: "Default workflow per app" always resolves a default for every app
  interface that has an available workflow (shipped bundle first, else the newest); "Clients choose"
  is gone, and each workflow is listed once across registry scopes.
• Pins abstractassistant 0.12.1: runs any registry scope the gateway resolves (fixes "Not sent —
  Unsupported workflow registry_scope for AbstractAssistant: private"), and Settings no longer offers
  "Keep the session after this app closes" (sessions belong to the gateway).