V6.13.0

Added

• An optional second state-of-charge sensor. Where a more accurate BMS measures the same
  battery, the whole cascade now computes in its scale, and the difference to the inverter's
  own reading is applied at the register boundary only: added when the discharge floor is
  written, subtracted when it is read back. The inverter enforces its ToU registers against
  its own BMS, so a floor derived from the accurate reading was enforced at the wrong state
  of charge. Without the sensor the difference is zero and nothing changes.
• A logbook message when the second reading is unusable and control falls back to the
  inverter's own value. Nothing about the behaviour shows that fallback, and a reading taken
  as zero would pull the floor to the bottom.

Changed

• The state-of-charge field is now explicitly the value the inverter itself sees; the more
  accurate sensor belongs in the new field. Instances that followed the earlier hint and put
  a shadow sensor in the old field have to swap the two before the new one takes effect.
• The inverter's shutdown state of charge is converted into the control scale before the
  backup reserve builds on it, because that reserve is what holds in an outage.
• Without discharge planning the ToU minimum is written converted as well, so the configured
  percentage means the same state of charge everywhere it is used.
• The balancing voltage stays as an input, now only as the threshold at which the measured pack
  voltage counts as full while every BMS is offline — the fallback that starts a balancing run
  when no cell voltages are readable. It is named and described for that role; value and effect
  are unchanged.

Removed

• The blueprint no longer writes any voltage to the inverter. Raising the float voltage for a
  cell-balancing run, setting it back when the cooldown timer expires and the midnight check that
  caught a voltage left raised by a lost timer are gone, together with the two float-voltage
  inputs and the timer triggers that existed only to drive them. Writing a setpoint the charger
  already manages means owning its failure modes for no gain: cell balancing works through the
  throttled charge current alone.