r1 H1: a previous frontend sends every space without the unknown field and
the ordinary write path replaced the document with it, erasing every LED
strip. The shared ordinary-writer helper now copies the stored shapes of a
space the payload omits (config/set and Optimize); an explicit list from a
new client still deletes, a removed space takes its strips, and a link to a
marker the same write deleted unbinds by the usual rule. config/set reports
the normalisation counters after the preservation.
Issue: #780
User-Visible: no
Codex
ef3e7a5440