AI Limits v0.6.2

Added

• Terminal installs. A one-line PowerShell install
  (irm .../install.ps1 | iex) that verifies the installer against the
  release digest before running it, a Chocolatey package, and a Scoop
  manifest. A portable zip (the two exes plus the licence texts, no
  installer) is now attached to every release.

Changed

• A copy not managed by the installer no longer self-updates. Running
  from a Scoop directory, an unpacked zip or a dev build, the auto-updater
  used to install a second copy into the regular install directory and leave
  the running one stale. It now recognises that the copy is not the one the
  installer put on disk, logs the available version, and leaves the update to
  whatever installed it. Installer copies, including those in a custom
  directory, update exactly as before.