v0.3.1

Fixed

• Self-update never downgrades: mta upgrade now only replaces the binary
  when the release is strictly newer, and reports "already up to date" instead of
  a false "updated" on a no-op.
• Install-channel detection no longer treats any path containing "scoop"
  (e.g. …/scoopproject/…) as Scoop-managed; it matches a real path segment, so
  standalone binaries in such paths can still self-update.
• Windows sleep-prevention assertion: the daemon goroutine is pinned to its
  OS thread, so the thread-affine SetThreadExecutionState is set and cleared on
  the same thread and never leaks after deactivation/shutdown.
• self install/self update no longer leave a partial *.tmp file behind when
  a copy fails.
• TUI Settings clamps jitter below the interval, so you can no longer set a
  value that fails validation on save.
• doctor now emits a warning (instead of silently dropping the row) when the
  macOS screensaver idle time can't be parsed, and doesn't compare against a
  zero interval when the config failed to load.

Added

• TUI Override menu offers timed "Force inactive" presets (1h / 2h / 4h),
  matching the CLI's off --for and the existing "Force active" presets.
• mta upgrade --check --json now reports the install channel name (string)
  plus a self_updatable boolean.

Documentation

• Documented --purge / -Purge usage for the uninstall scripts and the
  one-hour DST-changeover-day caveat for overnight schedule windows.

Full Changelog: v0.3.0...v0.3.1