dsh-edit-resend: Edit and Resend Sent Messages in DSH

dsh-edit-resend is an MIT-licensed plugin maintained by mbj733, designed to solve the problem that the DeepSeek Harness (DSH) web interface cannot edit already-sent messages in place. This plugin empowers developers to edit and resend user inputs, assistant thoughts, or replies after a message has been sent, with support for stopping in-progress responses, regenerating the last finalized reply, and retrying any historical turn. In single-conversation mode, old versions are automatically archived, and the sidebar maintains a single conversation title unchanged, ensuring a smooth editing experience. The plugin offers two cascade strategies, `truncate` and `preserve`, and features a failure visibility mechanism to ensure clear operation feedback. Installation only requires executing the `dsh plugin` command and restarting the service, while building from source involves installing dependencies via npm and running the build process.