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/tui/src/feature-plugins/sidebar/files.tsx

@@ -0,0 +1,70 @@
+import type { TuiPlugin, TuiPluginApi } from "@opencode-ai/plugin/tui"
+import type { BuiltinTuiPlugin } from "../builtins"
+import { createMemo, For, Show, createSignal } from "solid-js"
+import { Locale } from "../../util/locale"
+
+const id = "internal:sidebar-files"
+
+function changeCountWidth(item: { additions: number; deletions: number }) {
+  return [item.additions ? `+${item.additions}` : "", item.deletions ? `-${item.deletions}` : ""]
+    .filter(Boolean)
+    .join(" ").length
+}
+
+function View(props: { api: TuiPluginApi; session_id: string }) {
+  const [open, setOpen] = createSignal(true)
+  const theme = () => props.api.theme.current
+  const list = createMemo(() => props.api.state.session.diff(props.session_id))
+
+  return (
+    <Show when={list().length > 0}>
+      <box>
+        <box flexDirection="row" gap={1} onMouseDown={() => list().length > 2 && setOpen((x) => !x)}>
+          <Show when={list().length > 2}>
+            <text fg={theme().text}>{open() ? "▼" : "▶"}</text>
+          </Show>
+          <text fg={theme().text}>
+            <b>Modified Files</b>
+          </text>
+        </box>
+        <Show when={list().length <= 2 || open()}>
+          <For each={list()}>
+            {(item) => (
+              <box flexDirection="row" gap={1} justifyContent="space-between">
+                <text fg={theme().textMuted} wrapMode="none">
+                  {Locale.truncateLeft(item.file, Math.max(2, 36 - changeCountWidth(item)))}
+                </text>
+                <box flexDirection="row" gap={1} flexShrink={0}>
+                  <Show when={item.additions}>
+                    <text fg={theme().diffAdded}>+{item.additions}</text>
+                  </Show>
+                  <Show when={item.deletions}>
+                    <text fg={theme().diffRemoved}>-{item.deletions}</text>
+                  </Show>
+                </box>
+              </box>
+            )}
+          </For>
+        </Show>
+      </box>
+    </Show>
+  )
+}
+
+const tui: TuiPlugin = async (api) => {
+  api.slots.register({
+    order: 500,
+    slots: {
+      sidebar_content(_ctx, props) {
+        return <View api={api} session_id={props.session_id} />
+      },
+    },
+  })
+}
+
+const plugin: BuiltinTuiPlugin = {
+  id,
+  tui,
+}
+
+export default plugin