SAFETY-136: the line said 10 to 15 s late is not caught, then that 15 s late
is caught after about 4 minutes. It now says 10 s is not caught and 15 s only
after about 4 minutes, as the card says.
SAFETY-138: the 30 s timer that zeroes a late write is the ESPHome board's
watchdog (README), not the inverter's own.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Minor bump, no option changes. Folds "Not in a release yet" into a new
0.21.0 section, adds the contents table for the nine merges on release/1.0
since master 0.20.1, updates the known issues, and rewrites the 0.20.1
SAFETY-128 known issue to say it ships in 0.21.0.
Co-Authored-By: Claude <noreply@anthropic.com>