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/session-select.test.ts

@@ -0,0 +1,66 @@
+import { describe, expect } from "bun:test"
+import { Effect, Layer } from "effect"
+import { Session } from "@/session/session"
+import { TestInstance } from "../fixture/fixture"
+import { testEffect } from "../lib/effect"
+import { httpApiLayer, requestInDirectory } from "./httpapi-layer"
+
+const it = testEffect(Layer.mergeAll(Session.defaultLayer, httpApiLayer))
+
+describe("tui.selectSession endpoint", () => {
+  it.instance(
+    "should return 200 when called with valid session",
+    () =>
+      Effect.gen(function* () {
+        const tmp = yield* TestInstance
+        const session = yield* Session.use.create({})
+
+        const response = yield* requestInDirectory("/tui/select-session", tmp.directory, {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ sessionID: session.id }),
+        })
+
+        expect(response.status).toBe(200)
+        const body = yield* response.json
+        expect(body).toBe(true)
+      }),
+    { git: true },
+  )
+
+  it.instance(
+    "should return 404 when session does not exist",
+    () =>
+      Effect.gen(function* () {
+        const tmp = yield* TestInstance
+        const nonExistentSessionID = "ses_nonexistent123"
+
+        const response = yield* requestInDirectory("/tui/select-session", tmp.directory, {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ sessionID: nonExistentSessionID }),
+        })
+
+        expect(response.status).toBe(404)
+      }),
+    { git: true },
+  )
+
+  it.instance(
+    "should return 400 when session ID format is invalid",
+    () =>
+      Effect.gen(function* () {
+        const tmp = yield* TestInstance
+        const invalidSessionID = "invalid_session_id"
+
+        const response = yield* requestInDirectory("/tui/select-session", tmp.directory, {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ sessionID: invalidSessionID }),
+        })
+
+        expect(response.status).toBe(400)
+      }),
+    { git: true },
+  )
+})