feat: issue #25 implemented - cli

lib/bds/application.ex

@@ -12,6 +12,11 @@ defmodule BDS.Application do
     [{BDS.Desktop.Server, []}, BDS.CliSync.Watcher, BDS.Server]
   end
 
+  # CLI mode (issue #25): a one-shot command run against the shared database.
+  # No HTTP listener, SSH daemon, window, or sync watcher — the CLI is the
+  # external writer the watcher in a concurrently running app listens for.
+  def mode_children(:cli, _env), do: []
+
   # Local TUI: the headless server plus a TUI on the launching terminal, so
   # a GUI (via tunnel) and the local terminal can work in parallel. Quitting
   # this TUI stops the whole VM — the terminal is the app in this mode.