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/cli/run/footer.menu.test.ts

@@ -0,0 +1,43 @@
+import { expect, test } from "bun:test"
+import { createRoot } from "solid-js"
+import { FOOTER_MENU_ROWS, createFooterMenuState } from "@/cli/cmd/run/footer.menu"
+
+function mount(count: number, limit = FOOTER_MENU_ROWS) {
+  let dispose!: () => void
+  let menu!: ReturnType<typeof createFooterMenuState>
+
+  createRoot((nextDispose) => {
+    dispose = nextDispose
+    menu = createFooterMenuState({ count: () => count, limit })
+    return null
+  })
+
+  return { menu, dispose }
+}
+
+test("footer menu scrolls before the selected row hits the bottom edge", () => {
+  const state = mount(20)
+
+  try {
+    Array.from({ length: 6 }).forEach(() => state.menu.move(1))
+
+    expect(state.menu.selected()).toBe(6)
+    expect(state.menu.offset()).toBe(1)
+  } finally {
+    state.dispose()
+  }
+})
+
+test("footer menu scrolls before the selected row hits the top edge", () => {
+  const state = mount(20)
+
+  try {
+    Array.from({ length: 13 }).forEach(() => state.menu.move(1))
+    Array.from({ length: 4 }).forEach(() => state.menu.move(-1))
+
+    expect(state.menu.selected()).toBe(9)
+    expect(state.menu.offset()).toBe(7)
+  } finally {
+    state.dispose()
+  }
+})