A supervised long-running OS process.

Wraps NetRunner.Process for integration into a supervision tree. Automatically drains stdout/stderr to prevent pipe blocking. Both streams are delivered to the :on_output callback; stderr is owned by the Daemon's own drain task (the underlying process runs with stderr: :disabled), so :on_output sees the complete stderr stream in order.

Usage

# In your supervision tree:
children = [
  {NetRunner.Daemon, cmd: "redis-server", args: ["--port", "6380"], name: MyApp.Redis}
]

# Or start manually:
{:ok, pid} = NetRunner.Daemon.start_link(cmd: "tail", args: ["-f", "/var/log/syslog"],
                                          on_output: :log)

# Interact:
NetRunner.Daemon.os_pid(pid)
NetRunner.Daemon.alive?(pid)
NetRunner.Daemon.write(pid, "input\n")