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/opencode/test/cli/mcp-add.test.ts

@@ -0,0 +1,74 @@
+import { describe, expect } from "bun:test"
+import { Effect } from "effect"
+import path from "path"
+import { cliIt } from "../lib/cli-process"
+
+describe("opencode mcp add (non-interactive subprocess)", () => {
+  cliIt.concurrent(
+    "adds a remote server with HTTP headers",
+    ({ home, opencode }) =>
+      Effect.gen(function* () {
+        const result = yield* opencode.spawn([
+          "mcp",
+          "add",
+          "github",
+          "--url",
+          "https://example.com/mcp",
+          "--header",
+          "Authorization=Bearer {env:GITHUB_TOKEN}",
+          "--header",
+          "X-Option=one=two",
+        ])
+        opencode.expectExit(result, 0)
+
+        const config = yield* Effect.promise(() =>
+          Bun.file(path.join(home, ".config", "opencode", "opencode.json")).json(),
+        )
+        expect(config.mcp.github).toEqual({
+          type: "remote",
+          url: "https://example.com/mcp",
+          headers: {
+            Authorization: "Bearer {env:GITHUB_TOKEN}",
+            "X-Option": "one=two",
+          },
+        })
+      }),
+    60_000,
+  )
+
+  cliIt.concurrent(
+    "adds a local server while preserving argv and environment values",
+    ({ home, opencode }) =>
+      Effect.gen(function* () {
+        const result = yield* opencode.spawn([
+          "mcp",
+          "add",
+          "local",
+          "--env",
+          "API_KEY=secret",
+          "--env",
+          "VALUE=one=two",
+          "--",
+          "npx",
+          "-y",
+          "@example/server",
+          "--label",
+          "two words",
+        ])
+        opencode.expectExit(result, 0)
+
+        const config = yield* Effect.promise(() =>
+          Bun.file(path.join(home, ".config", "opencode", "opencode.json")).json(),
+        )
+        expect(config.mcp.local).toEqual({
+          type: "local",
+          command: ["npx", "-y", "@example/server", "--label", "two words"],
+          environment: {
+            API_KEY: "secret",
+            VALUE: "one=two",
+          },
+        })
+      }),
+    60_000,
+  )
+})