feat(mini): migrate mini to v2 (#34895)

feat(run): migrate non-interactive prompts to V2
feat(run): route mini prompts through V2
fix(run): use current session contracts
fix(run): fix V2 prompt turns
feat(cli): add mini subcommand
feat(run): use settled execution events
fix(run): handle remote prompt file attachments
feat(run): send prompt files as attachments
feat(run): use current APIs for run state
fix(run): adopt app-node runtime deps
feat(run): track subagent sessions
feat(run): move catalogs and default model onto current APIs

packages/protocol/src/groups/model.ts

@@ -21,6 +21,21 @@ export const ModelGroup = HttpApiGroup.make("server.model")
         }),
       ),
   )
+  .add(
+    HttpApiEndpoint.get("model.default", "/api/model/default", {
+      query: LocationQuery,
+      success: Location.response(Schema.UndefinedOr(Model.Info)),
+      error: ServiceUnavailableError,
+    })
+      .annotateMerge(locationQueryOpenApi)
+      .annotateMerge(
+        OpenApi.annotations({
+          identifier: "v2.model.default",
+          summary: "Get default model",
+          description: "Retrieve the model used when a session has no explicit model selection.",
+        }),
+      ),
+  )
   .annotateMerge(
     OpenApi.annotations({
       title: "models",