dsh-flash-gn: Flash Guide Number Calculator

DeepSeek Harness (DSH) provides a localized flash GN value calculation tool plugin, `dsh-flash-gn`. The plugin is maintained by community developer `uckkk`, implemented in pure Node, and has no network dependencies. Through the `flash_gn` tool, it allows agents to calculate flash settings precisely based on the provided parameters. Users can install and enable the plugin via the command line and invoke the related tools in DSH sessions. The plugin runs with the current process permissions; checking the source code and license before installation is recommended.