dsh-peer-link: Native Point-to-Point Messaging for DSH Sessions

dsh-peer-link is a DSH plugin designed to enable point-to-point communication between DSH sessions and other agent sessions (such as Claude Code) on the same machine via Unix Socket. This plugin registers the DSH process as a discoverable peer, distinguishes specific sessions through short IDs, and supports injecting received messages into DSH sessions in the form of user bubbles. Core functionalities include `peer_send` (for sending messages to a specified peer or socket path) and `peer_list` (for viewing active peers, with support for directory filtering, sorting, and interactive operations). Installation requires using the `dsh plugin` command to add the plugin repository. If communication with Claude Code is needed, Claude Co