Locate past OpenCode sessions by searching text within their chat messages, optionally filtered by date range. Use when the user wants to find, resume, or inspect an OpenCode session but only remembers something that was said in it (a phrase, identifier, file path, error message) and has forgotten the session id, title, or working directory. Triggers on requests like "find my opencode session about X", "which session did I discuss Y in", "I forgot the work directory but I have a search text".
