feat: 品牌替换 + 启动优化 + AGENTS.md 模板定制

- 品牌替换：OpenCode/opencode → AirCoding/aircoding（16+ 文件）
- Logo ASCII art：修复 left/right 行数不匹配导致的启动崩溃
- 启动诊断：添加 OPENCODE_PRINT_TIMING 计时探针
- dev 模式默认 --pure 跳过外部插件加载
- AGENTS.md 模板：追加 AirCoding 多 Agent 专项段落
- architect prompt + plugin：强化 AGENTS.md 产出验证

packages/opencode/test/util/iife.test.ts

@@ -0,0 +1,36 @@
+import { describe, expect, test } from "bun:test"
+import { iife } from "../../src/util/iife"
+
+describe("util.iife", () => {
+  test("should execute function immediately and return result", () => {
+    let called = false
+    const result = iife(() => {
+      called = true
+      return 42
+    })
+
+    expect(called).toBe(true)
+    expect(result).toBe(42)
+  })
+
+  test("should work with async functions", async () => {
+    let called = false
+    const result = await iife(async () => {
+      called = true
+      return "async result"
+    })
+
+    expect(called).toBe(true)
+    expect(result).toBe("async result")
+  })
+
+  test("should handle functions with no return value", () => {
+    let called = false
+    const result = iife(() => {
+      called = true
+    })
+
+    expect(called).toBe(true)
+    expect(result).toBeUndefined()
+  })
+})