dsh-cursor-subscription: Use Cursor subscription directly in DeepSeek Harness

dsh-cursor-subscription is a DSH plugin maintained by orrinzeng (MIT licensed) that allows existing Cursor subscription users to directly use subscription models in DSH via browser PKCE login. It requires no API Key and does not depend on the Cursor IDE or CLI. Core features include local credential storage and automatic token refresh, dynamically discovering available models via GetUsableModels (falling back to a built-in list on failure), streaming conversation output, converting Cursor tool requests to local DSH tool execution, as well as usage monitoring and runtime configuration (tool round limits, HTTP retry strategies). To install, use `dsh plugin --profile web add dsh-cursor-subscription`.