feat: support per-bot workspace switching

src/channels/shared/workspace-command.mjs

@@ -0,0 +1,26 @@
+const WORKSPACE_COMMAND = /^\/workspace(?:\s+([\s\S]+))?$/i;
+
+export async function runWorkspaceCommand(text, harness) {
+  if (typeof text !== 'string') return null;
+  const match = WORKSPACE_COMMAND.exec(text.trim());
+  if (!match) return null;
+  const workspace = match[1]?.trim();
+  if (!workspace) {
+    return { handled: true, message: '用法：/workspace 工作区绝对路径' };
+  }
+  if (typeof harness?.switchWorkspace !== 'function') {
+    return { handled: true, message: '当前机器人暂不支持切换工作区。' };
+  }
+  try {
+    const current = await harness.switchWorkspace(workspace);
+    return { handled: true, message: `工作区已切换为：${current}` };
+  } catch (error) {
+    if (['workspace-not-absolute', 'workspace-not-found', 'workspace-not-directory'].includes(error?.code)) {
+      return { handled: true, message: `${error.message}\n用法：/workspace 工作区绝对路径` };
+    }
+    if (error?.code === 'workspace-bot-not-found') {
+      return { handled: true, message: '机器人正在移除或已重新接入，无法切换原会话的工作区。' };
+    }
+    throw error;
+  }
+}