fix(core): disable Bun's fetch idle timeout for provider requests (#55007)

packages/core/src/effect/app-node-platform.ts

@@ -1,12 +1,26 @@
 import { LLMClient, RequestExecutor } from "@opencode/ai/route"
+import { Effect, Layer } from "effect"
+import { FetchHttpClient, HttpClient } from "effect/http"
 import { Socket } from "effect/socket"
 import { makeGlobalNode } from "@opencode/util/effect/app-node"
 import { httpClient } from "@opencode/util/effect/app-node-platform"
 import { WebSocketConstructor } from "./websocket-constructor.js"
 
+// Bun's fetch ends a request after five quiet minutes, before provider routes' own header and chunk timeouts.
+const withoutBunTimeout = Layer.effect(
+  HttpClient.HttpClient,
+  Effect.gen(function* () {
+    const client = yield* HttpClient.HttpClient
+    return HttpClient.transformResponse(
+      client,
+      Effect.provideService(FetchHttpClient.RequestInit, { timeout: false } as BunFetchRequestInit),
+    )
+  }),
+)
+
 export const requestExecutor = makeGlobalNode({
   service: RequestExecutor.Service,
-  layer: RequestExecutor.layer,
+  layer: RequestExecutor.layer.pipe(Layer.provide(withoutBunTimeout)),
   deps: [httpClient],
 })