Schema-driven mutation for hyperparameter maps.

Mutates values according to their type in the schema:

• Floats: Gaussian perturbation (log-space for log-scale)
• Integers: ±1 step with clamping
• Enums: Random reselection with low probability
• Lists: Mutate elements, insert, or delete

Options

• :schema - Schema definition (required)
• :rate - Mutation rate per parameter (default: from config)
• :gaussian_scale - Scale for Gaussian mutations (default: 0.1)

Example

schema = %{
  learning_rate: {:float, 0.001..0.1, :log},
  activation: {:enum, [:relu, :tanh]}
}

hparams = %{learning_rate: 0.01, activation: :relu}
mutate(hparams, config, schema: schema)