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/permission/arity.test.ts

@@ -0,0 +1,33 @@
+import { test, expect } from "bun:test"
+import { BashArity } from "../../src/permission/arity"
+
+test("arity 1 - unknown commands default to first token", () => {
+  expect(BashArity.prefix(["unknown", "command", "subcommand"])).toEqual(["unknown"])
+  expect(BashArity.prefix(["touch", "foo.txt"])).toEqual(["touch"])
+})
+
+test("arity 2 - two token commands", () => {
+  expect(BashArity.prefix(["git", "checkout", "main"])).toEqual(["git", "checkout"])
+  expect(BashArity.prefix(["docker", "run", "nginx"])).toEqual(["docker", "run"])
+})
+
+test("arity 3 - three token commands", () => {
+  expect(BashArity.prefix(["aws", "s3", "ls", "my-bucket"])).toEqual(["aws", "s3", "ls"])
+  expect(BashArity.prefix(["npm", "run", "dev", "script"])).toEqual(["npm", "run", "dev"])
+})
+
+test("longest match wins - nested prefixes", () => {
+  expect(BashArity.prefix(["docker", "compose", "up", "service"])).toEqual(["docker", "compose", "up"])
+  expect(BashArity.prefix(["consul", "kv", "get", "config"])).toEqual(["consul", "kv", "get"])
+})
+
+test("exact length matches", () => {
+  expect(BashArity.prefix(["git", "checkout"])).toEqual(["git", "checkout"])
+  expect(BashArity.prefix(["npm", "run", "dev"])).toEqual(["npm", "run", "dev"])
+})
+
+test("edge cases", () => {
+  expect(BashArity.prefix([])).toEqual([])
+  expect(BashArity.prefix(["single"])).toEqual(["single"])
+  expect(BashArity.prefix(["git"])).toEqual(["git"])
+})