- ifcurl/service.py: FastAPI POST /preview → image/png with three
caching tiers (bytes LRU, GUID-set LRU, PNG filesystem)
- ifcurl/git.py: add fetch_ifc() returning (hexsha, bytes); refactor
around _get_repo() and _read_commit_blob() helpers
- ifcurl/__main__.py: add 'ifcurl serve' subcommand; no-args prints
full help; all subcommands have descriptions and examples; URL format
and parameter reference in every help page
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