fix(delegate-task): extend default sync poll timeout to 30 minutes

Keep synchronous subagent runs from timing out after 10 minutes when no explicit override is configured.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/tools/delegate-task/timing.test.ts

@@ -3,6 +3,17 @@ const { describe, expect, test } = require("bun:test")
 import { __resetTimingConfig, __setTimingConfig, getDefaultSyncPollTimeoutMs } from "./timing"
 
 describe("timing sync poll timeout defaults", () => {
+  test("default sync timeout is 30 minutes", () => {
+    // #given
+    __resetTimingConfig()
+
+    // #when
+    const timeout = getDefaultSyncPollTimeoutMs()
+
+    // #then
+    expect(timeout).toBe(30 * 60 * 1000)
+  })
+
   test("default sync timeout accessor follows MAX_POLL_TIME_MS config", () => {
     // #given
     __resetTimingConfig()