Tests referenced old DQNParams fields (learning_rate, batch_size,
ensemble_size, etc.) that were absorbed into family intensity scalars.
Rewrote all affected tests to validate the 14D search space layout,
intensity bounds [0.0, 2.0], and round-trip serialization.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>