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/sdk/js/script/build.ts

@@ -0,0 +1,65 @@
+#!/usr/bin/env bun
+import { fileURLToPath } from "url"
+
+const dir = fileURLToPath(new URL("..", import.meta.url))
+process.chdir(dir)
+
+import { $ } from "bun"
+import path from "path"
+
+import { createClient } from "@hey-api/openapi-ts"
+
+const opencode = path.resolve(dir, "../../opencode")
+
+await $`bun dev generate > ${dir}/openapi.json`.cwd(opencode)
+
+await createClient({
+  input: "./openapi.json",
+  output: {
+    path: "./src/v2/gen",
+    tsConfigPath: path.join(dir, "tsconfig.json"),
+    clean: true,
+  },
+  plugins: [
+    {
+      name: "@hey-api/typescript",
+      exportFromIndex: false,
+    },
+    {
+      name: "@hey-api/sdk",
+      instance: "OpencodeClient",
+      exportFromIndex: false,
+      auth: false,
+      paramsStructure: "flat",
+    },
+    {
+      name: "@hey-api/client-fetch",
+      exportFromIndex: false,
+      baseUrl: "http://localhost:4096",
+    },
+  ],
+})
+
+// Patch a @hey-api/openapi-ts codegen bug: SseFn incorrectly passes the
+// endpoint's TError into the second generic of ServerSentEventsResult, which
+// is the AsyncGenerator's TReturn slot. Iterator return values have nothing
+// to do with HTTP errors, and any consumer that calls `.return()` or returns
+// from a mock generator gets type-checked against the wrong shape. Drop the
+// arg so TReturn defaults to void.
+const sseTypesPath = "./src/v2/gen/client/types.gen.ts"
+const sseTypesFile = Bun.file(sseTypesPath)
+const sseTypesSource = await sseTypesFile.text()
+const sseTypesPatched = sseTypesSource.replace(
+  "=> Promise<ServerSentEventsResult<TData, TError>>",
+  "=> Promise<ServerSentEventsResult<TData>>",
+)
+if (sseTypesPatched === sseTypesSource) {
+  throw new Error(`SseFn patch did not apply; @hey-api/openapi-ts output may have changed (${sseTypesPath})`)
+}
+await Bun.write(sseTypesPath, sseTypesPatched)
+
+await $`bun prettier --write src/gen`
+await $`bun prettier --write src/v2`
+await $`rm -rf dist`
+await $`bun tsc`
+await $`rm openapi.json`