Prints the location and size of all three on-disk caches — the downloaded
repository-FILE cache, the repository-LISTING cache (dataset/record
metadata, off by default – see repo_info_cache_clear()), and the LLM-response
cache — so they are never hidden. Files are kept between sessions only when
you ask for it (cache = TRUE in a module, or llm_cache(TRUE)); each
lasting cache then sits in a folder in the current working directory
(.metacheck_repo_cache, .metacheck_repo_info_cache, and
.metacheck_llm_cache); relocate all three with
options(metacheck.cache.dir = "/some/path"). While llm_cache() is
FALSE, the LLM row shows this session's temporary folder.
