[MINOR] `ControlVariateStrategy ==` ignores `base_logpdf_type`

[MINOR] ControlVariateStrategy == ignores base_logpdf_type

Summary

Base.:(==) for ControlVariateStrategy (src/strategies/control_variate.jl:29-31) compares only nsamples and buffer. The base_logpdf_type field (a type parameter that changes dispatch behaviour via preprocess_strategy_argument/convert(TL, ...)) is ignored, so two strategies that behave differently can compare equal.

function Base.:(==)(a::ControlVariateStrategy, b::ControlVariateStrategy)::Bool
    return get_nsamples(a) == get_nsamples(b) && get_buffer(a) == get_buffer(b)
end

Impact

Low, but equality semantics are inconsistent with the strategy's actual behaviour and can mask bugs in tests/downstream code that rely on == to detect differing strategy configuration.

Suggested fix

Include get_base_logpdf_type(a) == get_base_logpdf_type(b) (add a getter or compare the fields directly) in the equality comparison.

Start in src/strategies/control_variate.jl:29-31 and inspect how base_logpdf_type is represented, including preprocess_strategy_argument and convert(TL, ...). Update the equality behavior so strategies with different base_logpdf_type values are not equal, then run the relevant project tests and verify existing equality behavior remains correct.