Adds control::Add2 under /Fire and links /AHU20_1/RetPres/RetSet.value to its
in1. That slot already had two links inside RetPres, so it now carries both an
unreachable same-sheet link and one leaving the sheet -- the only arrangement
that draws the half-and-half knob, and one no sheet in this file produced
before. It caught that marker rendering wrongly at its real 8px size.
RetPres is also tidied, which moved seven meta positions onto one row.
The diff covers the whole file because saving re-serializes it: the schema and
every other component and link are unchanged.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>