dsh-session-search-pro: Search back history and active sessions in the current DSH session

dsh-session-search-pro is a DSH memory plugin maintained by YaoleWu. It provides agents with three read-only tools—agent_session_search, agent_session_list, and agent_session_read—via the sessionQuery service built into Harness. It features zero runtime dependencies and is capable of searching for currently active sessions. The article outlines two installation methods (modifying the profile's package.json and using --patch for temporary mounting), parameter tables for the three tools, the mechanism for falling back to bounded scanning when the index is disabled by default in the default profile, how to enable the index, plugin configuration options, as well as applicable scenarios and precautions.