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/storybook/.storybook/mocks/app/context/sdk.ts

@@ -0,0 +1,25 @@
+const make = (directory: string) => ({
+  session: {
+    create: async () => ({ data: { id: "story-session" } }),
+    prompt: async () => ({ data: undefined }),
+    shell: async () => ({ data: undefined }),
+    command: async () => ({ data: undefined }),
+    abort: async () => ({ data: undefined }),
+  },
+  worktree: {
+    create: async () => ({ data: { directory: `${directory}/worktree-1` } }),
+  },
+})
+
+const root = "/tmp/story"
+
+export function useSDK() {
+  return {
+    directory: root,
+    url: "http://localhost:4096",
+    client: make(root),
+    createClient(input: { directory: string }) {
+      return make(input.directory)
+    },
+  }
+}