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CLI shim: --types a,b,c | --scan-classes dir1:dir2 --out path [--json fqn] [--discovery explicit|opt-out|opt-in]. Requires at least one of: --types, --scan-classes, or a non-explicit --discovery (which falls back to the classpath manifest, TYPES_RESOURCE). --scan-classes takes File.pathSeparator-separated class directories.