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/editor.test.ts

@@ -0,0 +1,32 @@
+import { afterEach, expect, test } from "bun:test"
+import { normalizePromptContent, openEditor } from "../src/editor"
+
+const editor = process.env.EDITOR
+const visual = process.env.VISUAL
+
+afterEach(() => {
+  process.env.EDITOR = editor
+  process.env.VISUAL = visual
+})
+
+test("rejects when the external editor cannot start", async () => {
+  delete process.env.VISUAL
+  process.env.EDITOR = "opencode-editor-that-does-not-exist"
+  const renderer = {
+    suspend() {},
+    resume() {},
+    requestRender() {},
+    currentRenderBuffer: { clear() {} },
+  }
+
+  await expect(openEditor({ value: "original", renderer: renderer as never })).rejects.toThrow()
+})
+
+test("normalizes a single trailing editor newline for one-line prompts", () => {
+  expect(normalizePromptContent("hello\n")).toBe("hello")
+  expect(normalizePromptContent("hello\r\n")).toBe("hello")
+})
+
+test("preserves multiline prompts that end with a newline", () => {
+  expect(normalizePromptContent("hello\nworld\n")).toBe("hello\nworld\n")
+})