Fix max_value calculation in permutation_symmetries strategy

[Copilot]

Addresses feedback from #626 (comment)

The max_value parameter in the permutation_symmetries hypothesis strategy had a copy-paste error: len(parameter_names_pool) // len(parameter_names_pool) always evaluates to 1.

Changes

• Fixed calculation to len(parameter_names_pool) // n_params - 1 in tests/hypothesis_strategies/symmetries.py:55

This correctly computes the maximum number of copermuted groups that can fit in the parameter pool without exceeding available parameters.

# Before: always 1
max_value=len(parameter_names_pool) // len(parameter_names_pool)

# After: actual max groups possible
max_value=len(parameter_names_pool) // n_params - 1

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