ClusteringConfig

Language-independent config for an rtemis clustering run. Mirrors the `ClusteringConfig` object: an algorithm name and its settings. The same config drives rtemis (R), rtemis CLI/shell, and rtemislive to identical output. `algorithm` selects the variant and its settings are siblings of it, validated against the variant's own schema below. Anything not set takes rtemis's default, so an object holding only `algorithm` is that variant with every default.