actop 1.4.12

Fixed

• Memory bandwidth chart scaling: the Mem BW chart and the MEM-BOUND
  saturation alert now normalize against the SoC's true unified-memory
  bandwidth (a single max_mem_bw per profile), replacing the old
  cpu_max_bw + gpu_max_bw sum. Apple Silicon has one shared DRAM bus, so
  summing the two overstated the ceiling (e.g. 800 GB/s vs. the real 546 GB/s
  on M4 Max) — the chart could never exceed ~68% and the 85%-default
  MEM-BOUND alert (680 GB/s) was physically unreachable. The chart now spans
  the real 0–100% range and the alert can fire.
• Memory bandwidth reading on multi-die SoCs (Ultra): _compute_bandwidth_gbps
  now computes each memory-controller die's residency-weighted average
  independently and sums them, instead of pooling every die's histogram
  into one mean. Pooling reported a single controller's rate as the whole-chip
  total, under-reporting multi-die bandwidth. Single-die SoCs are unaffected.
• Power chart auto scaling: the CPU/GPU power charts now normalize against a
  true rolling peak over the retained wattage history, matching the
  documented "rolling peak" behavior. Previously the peak was an all-time
  monotonic max, so a single transient spike permanently compressed the charts
  for the rest of the session.

Changed

• SocProfile / DashboardConfig: replaced the unused cpu_max_bw /
  gpu_max_bw split (only ever consumed summed) with a single max_mem_bw
  unified-memory-bandwidth reference carrying real vendor headline specs.

Docs

• docs/DESIGN-system.md §3.5 / §7: document the per-die sum and the
  single max_mem_bw normalization reference.