feat: add bounded history previews across nine channels

Add shared /history parsing, read-only session access, message filtering, and bounded replies. Default to three messages, cap at five, and exclude saved history commands.

Include channel integration tests, translations, command help, and the Issue #62 implementation plan.

src/channels/shared/workspace-command.mjs

@@ -344,6 +344,7 @@ async function runSessionBindCommand(command, harness, conversationKey) {
       t('标题：{title}', { title }),
       `ID：${boundSessionId}`,
       t('归档：{archived}', { archived: bound?.archived === true ? t('是') : t('否') }),
+      t('发送 /history 查看最近对话。'),
     ].join('\n');
     return commandResult(message, splitWorkspaceCommandMessage(message));
   } catch (error) {