dsh-crw: fastCRW Retrieval and Crawling Provider for the DeepSeek Harness

dsh-crw is an MIT-licensed DSH plugin designed to provide backend-based `web_search` and `web_fetch` services for DSH's `ctx.web` via fastCRW (AGPL-3.0). Its core functions include registering the `crw` provider within `ctx.web`, where the fastCRW server handles address resolution, verification, and private network rejection, and supports automatic upgrade from plain HTTP to browser-level capabilities. Search outputs are standardized to URL, title, and summary, while fetch results are returned in Markdown format. An optional `answer` configuration can also be enabled to synthesize answers using LLMs, though this incurs an additional LLM call. Regarding installation, it supports Cloud API (requires configuring `CRW`...