actop 1.3.1

Changed

• Layering cleanup LC-3 — alert, throttle, and session-energy analytics moved
  out of the TUI widget into L2 (actop.analytics). New AlertEngine owns the
  per-alert sustain counters, swap-rise window, and cumulative energy integral;
  AlertEngine.feed(snapshot) returns an AlertFrame (thermal/throttle/bw/pkg/
  swap verdicts + swap_rise_gb + session_energy_j). domain_throttling,
  bandwidth_percent, and package_power_percent are now module-level L2
  functions taking explicit reference values. The dashboard widget's
  _compute_alerts shrank to formatting the frame into status-line tokens; no
  alert/throttle/energy math remains in tui/. No visual change.
• Session energy is now integrated over the real inter-frame dt derived from
  SystemSnapshot.timestamp instead of the fixed sample interval. This is a
  correctness improvement (honest elapsed time), with one behavior note: the
  first frame contributes 0 J (no prior timestamp to diff against), whereas
  the old fixed-interval integral counted the first frame.