* fix(chat): require --title for direct messages, fix misleading help
`dws chat message send --user <id> --text ...` (and the --open-dingtalk-id
variant) failed at the API layer with the cryptic "发群服务窗会话消息失败"
when --title was omitted, because send_direct_message_as_user requires a
title at the business layer. The CLI advertised the opposite: the --title
flag description said "可选" (optional) and one help example sent a direct
message without it.
- Validate --title up front for --user / --open-dingtalk-id sends:
"--title is required for direct messages (--user / --open-dingtalk-id)".
Group messages are unchanged (title stays optional there).
- Fix the long help, the --title flag description, the help examples, and
skills/references/products/chat.md to say title is required for direct
messages, optional for group messages.
- Tests: add --title to the direct-message routing cases that now require
it, and add rejection cases for direct sends without --title.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* docs(changelog): add Unreleased entry for #250 chat send --title fix
---------
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
