Split Channels (SplC), Merge Spot Channel (MSpt), Trap (Trap) and Match
Color without a source (matchColor, noReference) load as channel.split,
channel.mergeSpot, image.trap and image.adjustments.matchColor and save
back with the keys Photoshop records. The split's recorded documentIDs
belong to its run and are neither replayed nor written; Trap's width is
clamped to 32767 px; Match Color takes Photoshop's defaults. Steps the
events cannot carry (a split keeping its original, a named spot
channel, a Match Color source or option) are refused on export.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>