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Parameters: query (req), limit 1-50 def 20, doc_types: pdf|docx|doc|pptx|xlsx|csv|epub|rtf|md|txt|html|image|audio|video, library (local://<id> or cloud://<owner>/<slug>), path_glob (substring-matched, * ? wildcards, case-sensitive), scope: folder|notes, tags[] (AND, notes), modified_after/before (ISO8601), time_sort: default|newest|oldest, output_format: markdown|json