DeepSeek Harness Conversation Interoperability Plugin: dsh-conversation-link

The `dsh-conversation-link` plugin enables collaboration among peer conversations within the same process for DeepSeek Harness (DSH). It supports conversation discovery and direct communication, progress monitoring, rule management, and peer conversation creation. Users can use CLI commands to assign tasks, send messages, or set rules for a conversation (constraining only itself), without pre-binding or imposing a sub-agent hierarchy. After installation, restart DSH and ensure the Node.js version meets the requirements.