dsh-opencli: Connecting Real Browsers and Site Adapters to DeepSeek Harness

The `dsh-opencli` plugin for DSH Harness provides “task execution” capabilities via OpenCLI. It drives actual browser windows through a browser extension and supports 176 sites with 200+ commands. Users can retrieve structured data and perform actions such as posting or approving, with all operations requiring approval by default. The plugin supports scheduled tasks, auditing, and concurrent multi-site execution. Installation requires deploying the OpenCLI environment first; ensure Windows paths are configured correctly, and note that headless servers are not supported.