V3 deterministic PDF page-extraction capability pack. By-value connector composition (service_kind=cli, no separate ingredient): the local Poppler pdfseparate CLI exposes readiness, fixed first-page extraction, and single selected-page extraction for one source PDF. Fixed-function and reproducible: the executor materializes the source PDF and owns the throwaway output directory, while pdfseparate writes exactly one page PDF per operation that is captured as result.file_ref. The pack deliberately avoids arbitrary page ranges and full-document splitting because pdfseparate writes one PDF per page and the current output_capture contract expects a single produced file. It exposes no password arguments, caller-controlled output pattern, stdin mode, shell wrapper, arbitrary flags, or network egress. Requires pdfseparate on PATH (Debian/Ubuntu: apt install poppler-utils; macOS: brew install poppler).