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Combines fuzzy text matching (positional QUERY on title and key) with
spec-aligned filter operators. Without a query, documents are sorted by
popularity (incoming references count); with --sort, frontmatter sort wins.

Filter shorthand flags are spec-named (--key, --included-by, --references,
--referenced-by, etc.). Use --filter for inline YAML predicates such as
--filter 'status: draft'.
