sluicify v0.4.0

Added

• sluice serve --rules-dir <dir> --socket-dir <dir> serves every
  <name>.rules on its own socket, <socket-dir>/<name>/sluice.sock,
  from one process, and follows files added, changed and removed.
• sluice check --rules-dir <dir>.
• A listing request: sluicify --list <socket> and list() in
  sluicify-native print each rule's command line, the comment lines
  above it, and what each slot accepts.
• ERR_TOO_LARGE (-9): a listing longer than 64 KiB.

Changed

• sluicify-native requires Node ≥ 22.
• A request with no arguments is a listing request; it was ERR_PROTO.
• The broker says reloaded <file> after SIGHUP, where it said
  reload OK.