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/tui/test/context/local.test.ts

@@ -0,0 +1,22 @@
+import { expect, test } from "bun:test"
+import { parseModel, recentModels } from "../../src/context/local"
+
+test("parses model IDs containing slashes", () => {
+  expect(parseModel("provider/family/model")).toEqual({
+    providerID: "provider",
+    modelID: "family/model",
+  })
+})
+
+test("moves a model to the front, deduplicates, and limits recents", () => {
+  const recent = Array.from({ length: 12 }, (_, index) => ({
+    providerID: "provider",
+    modelID: `model-${index}`,
+  }))
+
+  expect(recentModels({ providerID: "provider", modelID: "model-5" }, recent)).toEqual([
+    { providerID: "provider", modelID: "model-5" },
+    ...recent.slice(0, 5),
+    ...recent.slice(6, 10),
+  ])
+})