fix: livrable tickets #70 #100 #102 — UX surface scoping

- #70: implémentation suppression modèles locaux téléchargés
- #100: correction scroll OpenCode
- #102: correction fit TUI après switch/layout
- memory note scoping UX

frontend/src/adapters/http/requestResponseGateways.ts

@@ -229,6 +229,9 @@ export class HttpModelServerGateway implements ModelServerGateway {
   async deleteModelServer(serverId: string): Promise<void> {
     await this.http.invoke("delete_model_server", { serverId });
   }
+  async deleteModelArtifact(serverId: string): Promise<void> {
+    await this.http.invoke("delete_model_artifact", { serverId });
+  }
   previewModelServerCommand(config: LocalModelServerConfig): Promise<ModelServerCommandPreview> {
     return this.http.invoke<ModelServerCommandPreview>("preview_model_server_command", { config });
   }