V3 deterministic CSV row-search capability pack. By-value connector composition (service_kind=cli, no separate ingredient): the local csvgrep CLI returns rows from one trusted local CSV path where a named column matches a literal string via the csv.search catalog operation. This is the reproducible csvkit-backed fallback for qsv search while qsv lacks a Debian-stable package. Path-based by design: matching CSV rows are stdout value output, so this operation does not combine file_ref materialization with stdout capture. Requires csvkit on PATH (Debian/Ubuntu: apt install csvkit; Python environments: pip install csvkit). Local and no-egress.