dsh-tavily-provider: Tavily Backend Search and Web Scraping

`dsh-tavily-provider` is a community plugin for DeepSeek Harness (DSH) that replaces the default search backend, supporting Tavily's `web_search` and `web_fetch` capabilities. It is maintained by MirrMeur and released under the MIT License. Installation is performed by adding it to the `web` profile via a CLI command, while configuration must be manually written to `cordis.patch.yml`. It supports setting the API key through a configuration file, a credentials service, or environment variables, and provides `basic`/`advanced` search depth as well as `general`/`news` topic selection. Error handling follows the DSH specification. The plugin has no UI, web_