test(elfeed): cover extract-stream-url and process-entries helpers

elfeed-config had only the youtube-feed-format helper under test; cj/extract-stream-url and cj/elfeed-process-entries were untested despite having clear error/boundary paths. Added characterization + Normal/Boundary/Error coverage: extract-stream-url returns the trimmed URL on success, nil on non-URL output or nonzero exit, and signals when yt-dlp is absent; process-entries applies the action per selected entry and marks read, errors when nothing is selected, skips entries with no link, catches per-entry action errors by default, and propagates them under skip-error-handling. yt-dlp (call-process) and the elfeed-search API are stubbed at the boundary.

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