Shepherd 0.15.0

Added

• Display lines take a line count, so a long excerpt can wrap instead of
  truncating.

Changed

• Shepherd tracks herdr protocol 19; a server on another protocol is
  monitored with a warning, and "not supported" appears only when reading
  it fails.
• The monospace row style matches the body text size.

Fixed

• Codex rows no longer mistake unrecognized history cells for the reply.
• Claude and Codex rows keep the latest excerpt while the pane is scrolled
  back, instead of picking up history or the scrollback indicator text.
• Menu excerpts show every configured line instead of sometimes truncating
  one line early.