Assert that verify, params, cert and auth reach a spawned child, and that a mounted adapter the child cannot reproduce falls back to the single-process path. Documents --download-processes in the CLI reference.
Spawned children re-import the module and start with no TokenBucket, so
--download-processes silently dropped a configured --speed-limit /
global_speed_limit for any 24+ segment batch. Fall back to the in-process
path while a limit is set (same gate as the ranged-parallel paths), log the
fallback, and document the interaction.