Shad0wwa1ker/dsh-per-request-cost

Composer pill with the DeepSeek account balance, the live peak/off-peak pricing phase, and this session's spend priced request by request at the rate in effect when each request was sent. Subagent sessions' costs are aggregated into the parent session; Search and Fetch fees are charged only for DeepSeek's search engine, while third-party engines (Tavily, Bing, Exa, …) are counted but free. The balance refresh interval is configurable.