Expand description
Centralized plan for the 5-digit system error codes.
The first digit hints the HTTP mapping (2=NoContent, 4=Client, 5=Server), while the middle two digits reserve blocks per domain (20=conf, 21=parse, 22=source, 23=dist, 24=run, 25=knowledge, 26=security, etc.). The last two digits are scoped reasons. Keeping these constants together makes future assignments deliberate and visible.