{"input": "SM00248", "source_db": "smart", "how": "remote", "expect": {"valid": true, "normalized": "SM00248"}, "note": "a real SMART domain"}
{"input": "SM99999", "source_db": "smart", "how": "remote", "expect": {"valid": false}, "note": "well-formed but not a current entry; the endpoint answers 204"}
{"input": "sm00248", "source_db": "smart", "how": "remote", "expect": {"valid": false, "suggestion": "SM00248"}, "note": "lowercase; the canonical form exists remotely"}
{"input": "SM0248", "source_db": "smart", "how": "remote", "expect": {"valid": false}, "note": "four digits; fails the grammar before any lookup"}
