pramana v0.1.0

• First release: a polkit authentication agent for desktops that don't
  bring one (sway, Hyprland, river…). When an app asks for admin rights the
  standard way (mounting a disk, a settings change, pkexec), a window
  shows what's asking (the message, the polkit action, the program) and
  takes your password; it goes to polkit's own helper, never anywhere else.
• Vyom's look in your varna theme, through the same readability checks as
  anumati's window: a theme can change tints, never hide anything.
• Choose who to authenticate as when polkit offers several admins (you
  first). A wrong password keeps the window open to try again; Esc cancels
  and the app is told no.
• Runs as the pramana user service in the graphical session, restarting
  on failure, and steps aside (exit 3, no restart) when another agent
  already serves the session. Logs to the journal (journalctl --user -u pramana).
• install.sh installs it root-owned into /usr/local and enables the service.
• It started inside anumati and became its own tool before release:
  anumati stays the approval window for AI agents' root commands.