dsh-web-search-all-modes: Presetting the web_search Tool for dsh Agent Recovery

dsh-web-search-all-modes is an MIT-licensed plugin within the DeepSeek Harness (DSH) ecosystem, designed to address the issue of inconsistent tool sets across different agent presets. By re-enabling the host-side `tool-web` configuration, this plugin allows DSH agent presets such as minimal mode, which do not natively include `web_search`, to invoke this tool without affecting presets that already have this functionality. Prerequisites include the profile being built on `@deepseek-ai/dsh-base`, along with proper configuration of `DEEPSEEK_API_KEY` and the host search provider. Installation can be performed via local source code or GitHub commands, and a restart is required after installation.