Deepseek Harness to Emacs bridge

Key features

• dsh-plugin/ — a DeepSeek Harness plugin (dsh-emacs-bridge).
• The DSH plugin registers its routes on the DSH web server's loopback listener, and the browser plugin calls only same-origin /dsh-bridge/ routes.
• emacs/dsh-bridge.el — an Emacs package to interact with the harness.
• This is a two-way bridge between Emacs and a Deepseek Harness session.
• The bridge moves text from Emacs to DeepSeek Harness (DSH), and vice versa, over loopback HTTP.