feat(plugin): add v2 effect host (#33111)

packages/core/src/session/runner/model.ts

@@ -33,11 +33,7 @@ export class UnsupportedApiError extends Schema.TaggedErrorClass<UnsupportedApiE
   },
 ) {}
 
-export type Error =
-  | Catalog.ProviderNotFoundError
-  | Catalog.ModelNotFoundError
-  | ModelNotSelectedError
-  | UnsupportedApiError
+export type Error = ModelNotSelectedError | UnsupportedApiError
 
 export interface Interface {
   readonly resolve: (session: SessionSchema.Info) => Effect.Effect<Model, Error>
@@ -149,10 +145,12 @@ export const locationLayer = Layer.effect(
       resolve: Effect.fn("SessionRunnerModel.resolve")(function* (session) {
         // Location plugins populate and filter the catalog asynchronously during layer startup.
         yield* boot.wait()
+        const defaultModel = session.model ? undefined : yield* catalog.model.default()
         const selected = session.model
           ? yield* catalog.model.get(session.model.providerID, session.model.id)
-          : (Option.getOrUndefined((yield* catalog.model.default()).pipe(Option.filter(supported))) ??
-            (yield* catalog.model.available()).find(supported))
+          : defaultModel && supported(defaultModel)
+            ? defaultModel
+            : (yield* catalog.model.available()).find(supported)
         if (!selected) return yield* new ModelNotSelectedError({ sessionID: session.id })
         const connection = yield* integrations.connection.forIntegration(Integration.ID.make(selected.providerID))
         return yield* fromCatalogModel(