The records move to ConfigRecords, free of the file system and the
shade model, with 33 unit tests: each record's size against the header,
a round trip of each, the layouts of versions 2 to 24, and a real backup
when CONFIG_BACKUP names one.
The tests found, and this fixes:
- A quoted value as long as its field (a hostname of 30 or more
characters, a full NTP server, MQTT host or time zone) was read short,
and every value after it shifted.
- A comma in a shade, group or room name shifted the rest of its record.
Names are read at their fixed width.
- 4.0 boards without Ethernet declared the network record 28 bytes longer
than they wrote it, so a restore of the radio without the network read
the radio from the middle of its record. Records are read and skipped
to their newline, and backup() measures what it writes.
- A restore cleared rooms beyond the backup's only on load.
A restore now takes the backup's rolling codes even when they are lower
than NVS's; a load still keeps the higher.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
