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/ui/script/build-oc2-v2-overrides.ts

@@ -0,0 +1,32 @@
+#!/usr/bin/env bun
+
+import { V2_PRIMITIVES_DEFAULT } from "../src/theme/v2/default-primitives"
+import type { DesktopTheme } from "../src/theme/types"
+
+const themePath = import.meta.dir + "/../src/theme/themes/oc-2.json"
+const theme = (await Bun.file(themePath).json()) as DesktopTheme
+const css = await Bun.file(import.meta.dir + "/../src/v2/styles/theme.css").text()
+
+const light = { ...V2_PRIMITIVES_DEFAULT, ...readTokens("light") }
+const dark = { ...V2_PRIMITIVES_DEFAULT, ...readTokens("dark") }
+
+const next: DesktopTheme = {
+  ...theme,
+  light: { ...theme.light, v2Overrides: light },
+  dark: { ...theme.dark, v2Overrides: dark },
+}
+
+await Bun.write(themePath, JSON.stringify(next, null, 2) + "\n")
+console.log("Updated oc-2.json v2Overrides", Object.keys(light).length, "tokens per mode")
+
+function readTokens(mode: "light" | "dark") {
+  const selector = mode === "light" ? ":root" : `\\[data-color-scheme="${mode}"\\]`
+  const block = css.match(new RegExp(`${selector} \\{([\\s\\S]*?)\\n  \\}`))?.[1]
+  if (!block) throw new Error(`Missing ${mode} OC-2 tokens`)
+  return Object.fromEntries(
+    [...block.matchAll(/--(v2-[\w-]+):\s*([^;]+);/g)]
+      // Fonts and the fixed avatar foreground remain global CSS rather than theme overrides.
+      .filter(([, key]) => key !== "v2-avatar-fg" && key !== "v2-font-family-sans")
+      .map(([, key, value]) => [key, value!.replace(/\s+/g, " ").trim()]),
+  )
+}