dsh-slack: DSH Community Plugin for Bidirectional Communication Between Agents and Slack

The DSH community plugin `dsh-slack` is designed to enable bidirectional communication between agents and Slack, providing four core tools: `slack_notify`, `slack_channels`, `slack_inbox`, and `slack_reply`. This plugin supports reading messages via Socket Mode, listing visible channels, sending Markdown notifications, and thread replies, but does not support RTM or interactive components such as buttons and modals. During installation, you need to configure the Slack bot token and app token (which can be set via the environment variables `DSH_SLACK_TOKEN` and `DSH_SLACK_APP_TOKEN` or through a configuration file), and execute `dsh plugin --profile w`