The `try...finally` block was removed as the `rm -rf` command
will still execute at the end of the function regardless of
the `ssh` command's exit status. This simplifies the code
without changing the cleanup behavior.

Moves Radicle password retrieval to be host-specific, using
1Password to provide different credentials for 'angmar' and 'sidhe',
improving multi-host secret management.

Enhances SSH agent startup to be more robust and XDG-compliant.
The agent is now only spawned if not already running, its socket
is placed in the XDG_RUNTIME_DIR, and its PID is reported upon start.

Sets a default `DFT_BACKGROUND` environment variable.