The exact tier of a model directory: the family that accepts its config,
where the model_type alone is ambiguous (MiniCPM5 shares llama); the
record-level tier when the config names no family or cannot be read.
Reads one config, so a registry calls it once per snapshot at index time.
The exact tier of a model directory: the family that accepts its config, where the
model_typealone is ambiguous (MiniCPM5 sharesllama); the record-level tier when the config names no family or cannot be read. Reads one config, so a registry calls it once per snapshot at index time.