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/server/httpapi-exercise/environment.ts

@@ -0,0 +1,40 @@
+import { Flag } from "@opencode-ai/core/flag/flag"
+import { Effect } from "effect"
+import path from "path"
+
+const preserveExerciseGlobalRoot = !!process.env.OPENCODE_HTTPAPI_EXERCISE_GLOBAL
+export const exerciseGlobalRoot =
+  process.env.OPENCODE_HTTPAPI_EXERCISE_GLOBAL ??
+  path.join(process.env.TMPDIR ?? "/tmp", `opencode-httpapi-global-${process.pid}`)
+process.env.XDG_DATA_HOME = path.join(exerciseGlobalRoot, "data")
+process.env.XDG_CONFIG_HOME = path.join(exerciseGlobalRoot, "config")
+process.env.XDG_STATE_HOME = path.join(exerciseGlobalRoot, "state")
+process.env.XDG_CACHE_HOME = path.join(exerciseGlobalRoot, "cache")
+process.env.OPENCODE_DISABLE_SHARE = "true"
+export const exerciseConfigDirectory = path.join(exerciseGlobalRoot, "config", "opencode")
+export const exerciseDataDirectory = path.join(exerciseGlobalRoot, "data", "opencode")
+
+const preserveExerciseDatabase = !!process.env.OPENCODE_HTTPAPI_EXERCISE_DB
+export const exerciseDatabasePath =
+  process.env.OPENCODE_HTTPAPI_EXERCISE_DB ??
+  path.join(process.env.TMPDIR ?? "/tmp", `opencode-httpapi-exercise-${process.pid}.db`)
+process.env.OPENCODE_DB = exerciseDatabasePath
+Flag.OPENCODE_DB = exerciseDatabasePath
+
+export const original = {
+  OPENCODE_SERVER_PASSWORD: Flag.OPENCODE_SERVER_PASSWORD,
+  OPENCODE_SERVER_USERNAME: Flag.OPENCODE_SERVER_USERNAME,
+}
+
+export const cleanupExercisePaths = Effect.promise(async () => {
+  const fs = await import("fs/promises")
+  if (!preserveExerciseDatabase) {
+    await Promise.all(
+      [exerciseDatabasePath, `${exerciseDatabasePath}-wal`, `${exerciseDatabasePath}-shm`].map((file) =>
+        fs.rm(file, { force: true }).catch(() => undefined),
+      ),
+    )
+  }
+  if (!preserveExerciseGlobalRoot)
+    await fs.rm(exerciseGlobalRoot, { recursive: true, force: true }).catch(() => undefined)
+})