Search, retrieve, and index local markdown knowledgebase files using the QMD CLI. Use this skill whenever the user wants to: search a local knowledgebase of markdown files, retrieve specific documents or passages from indexed collections, index or re-index a directory of .md files, check the status of the knowledge index, or perform any knowledge retrieval task against local documentation. Triggers: "search the knowledgebase", "find in docs", "index my files", "look up", "search notes", "retrieve document", "knowledge search", "what does the docs say about", "find information about", "re-index", "update the index".