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/desktop/electron-builder.config.test.ts

@@ -0,0 +1,48 @@
+import { expect, test } from "bun:test"
+import type { Configuration } from "electron-builder"
+
+const legacyDesktopEntry = "resources/linux/opencode-desktop.desktop"
+
+const channels = [
+  { channel: "dev", appId: "ai.opencode.desktop.dev" },
+  { channel: "beta", appId: "ai.opencode.desktop.beta" },
+  { channel: "prod", appId: "ai.opencode.desktop" },
+] as const
+
+for (const channel of channels) {
+  test(`uses one Linux desktop identity for ${channel.channel}`, async () => {
+    const previous = process.env.OPENCODE_CHANNEL
+    process.env.OPENCODE_CHANNEL = channel.channel
+
+    const module = await import(`./electron-builder.config.ts?channel=${channel.channel}`)
+    const config = module.default as Configuration
+
+    if (previous === undefined) delete process.env.OPENCODE_CHANNEL
+    else process.env.OPENCODE_CHANNEL = previous
+
+    expect(config.appId).toBe(channel.appId)
+    expect(config.extraMetadata?.desktopName).toBe(`${channel.appId}.desktop`)
+    expect(config.linux?.executableName).toBe(channel.appId)
+    expect(config.linux?.desktop?.entry?.StartupWMClass).toBe(channel.appId)
+  })
+}
+
+test("keeps a hidden prod launcher for old Linux pins", async () => {
+  const previous = process.env.OPENCODE_CHANNEL
+  process.env.OPENCODE_CHANNEL = "prod"
+
+  const module = await import("./electron-builder.config.ts?compat=prod")
+  const config = module.default as Configuration
+
+  if (previous === undefined) delete process.env.OPENCODE_CHANNEL
+  else process.env.OPENCODE_CHANNEL = previous
+
+  expect(config.deb?.fpm?.[0]).toEndWith(`${legacyDesktopEntry}=/usr/share/applications/opencode-desktop.desktop`)
+  expect(config.rpm?.fpm?.[0]).toEndWith(`${legacyDesktopEntry}=/usr/share/applications/opencode-desktop.desktop`)
+
+  const desktop = await Bun.file(legacyDesktopEntry).text()
+  expect(desktop).toContain("Exec=/opt/OpenCode/ai.opencode.desktop %U")
+  expect(desktop).toContain("Icon=ai.opencode.desktop")
+  expect(desktop).toContain("StartupWMClass=ai.opencode.desktop")
+  expect(desktop).toContain("NoDisplay=true")
+})