createCli parsed REA_LOG_LEVEL with a throwing schema, so an invalid or
uppercase value crashed every command, including doctor and --help, with
a ZodError stack trace. Parse it into a ConfigurationError result and have
the executable print the same configuration message as the MCP adapter
and exit 1 before building the CLI.
Fixes#2135
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Kaoru0822