Config.settings lists each setting once: its key, its environment
variable and the function that loads it. Most rows load through field,
whose arguments give the type, the default and the check. db_url and
cache_max_bytes keep their own load functions. Loading, the unknown-key
and unknown-variable checks and the names in error messages all read
the table. allowlist_hosts now loads through parseHostList.
isKnownConfigKey, envVarNames, strictLoader, validate,
validateAllowlistHostsValue and getStringSlice are gone, with the
getStringSlice tests. The key constants move to the tests, their only
users. README.md lists the settings one item each instead of in a
table. A new test checks that this list and configs/config.example.yml
name exactly the keys of the table.
Model: opus-5-5
