feat: add headerTimeout cfg option, default it on only for openai w/ default of 10s (#29484)

packages/opencode/test/session/retry.test.ts

@@ -7,6 +7,7 @@ import { CrossSpawnSpawner } from "@opencode-ai/core/cross-spawn-spawner"
 import { SessionRetry } from "../../src/session/retry"
 import { MessageV2 } from "../../src/session/message-v2"
 import { ProviderID } from "../../src/provider/schema"
+import { ProviderError } from "../../src/provider/error"
 import { SessionID } from "../../src/session/schema"
 import { SessionStatus } from "../../src/session/status"
 import { provideTmpdirInstance } from "../fixture/fixture"
@@ -163,6 +164,14 @@ describe("session.retry.retryable", () => {
     expect(SessionRetry.retryable(error, retryProvider)).toEqual({ message: msg })
   })
 
+  test("retries transport timeout errors", () => {
+    const request = MessageV2.fromError(new ProviderError.HeaderTimeoutError(10000), { providerID })
+    expect(MessageV2.APIError.isInstance(request)).toBe(true)
+    expect(SessionRetry.retryable(request, retryProvider)).toEqual({
+      message: "Provider response headers timed out after 10000ms",
+    })
+  })
+
   test("does not retry context overflow errors", () => {
     const error = new MessageV2.ContextOverflowError({
       message: "Input exceeds context window of this model",