dsh-tokensave: Integrate tokensave semantic graph into DSH to reduce code exploration tokens

Miku196/dsh-tokensave is an MIT-licensed DSH plugin designed to enable Agents to utilize semantic queries instead of time-consuming grep and per-file reading by connecting to the tokensave local semantic graph engine, thereby significantly reducing token consumption. Since version 0.2.0, the plugin adopts a CLI direct connection mode, eliminating the need to start a serve process or rely on MCP. Core features include: injecting tool usage instructions into system prompts; providing semantic graph tools such as search, callers, callees, body, entities, status, dead_code, and circular; automatically following the session's working directory upward to locate the most recent index and automatically executing init in fresh directories; and checking at startup...