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/local.ts

@@ -0,0 +1,41 @@
+import { createSignal } from "solid-js"
+
+const model = {
+  id: "claude-3-7-sonnet",
+  name: "Claude 3.7 Sonnet",
+  provider: { id: "anthropic" },
+  variants: { fast: {}, thinking: {} },
+}
+
+const agents = [{ name: "build" }, { name: "review" }, { name: "plan" }]
+
+const [agent, setAgent] = createSignal(agents[0].name)
+const [variant, setVariant] = createSignal<string | undefined>(undefined)
+
+export function useLocal() {
+  return {
+    slug: () => "c3Rvcnk=",
+    agent: {
+      list: () => agents,
+      current: () => agents.find((item) => item.name === agent()) ?? agents[0],
+      set(value?: string) {
+        if (!value) {
+          setAgent(agents[0].name)
+          return
+        }
+        const hit = agents.find((item) => item.name === value)
+        setAgent(hit?.name ?? agents[0].name)
+      },
+    },
+    model: {
+      current: () => model,
+      variant: {
+        list: () => Object.keys(model.variants),
+        current: () => variant(),
+        set(next?: string) {
+          setVariant(next)
+        },
+      },
+    },
+  }
+}