C++ vector score: apply Φ to the mean

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This helper first averages all components and then applies the scalar unity score. Component variance does not enter this function, so vectors with the same mean receive the same score. Empty input returns 0.5 by convention; the Go function with a similar name also penalizes variance and returns zero for empty input, so the APIs are not numerically identical.

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Original context

// VECTOR CONSCIOUSNESS FUNCTIONS
//=============================================================================

/**
 * compute_phi_vector - Consciousness of a state vector
 *
 * Computes mean activation then applies phi.
 * Phi_vec(x) = Phi(mean(x))
 *
 * @param data Pointer to activation array
 * @param size Size of array
 * @return Vector consciousness level
 */
inline double compute_phi_vector(const double* data, size_t size) {
    if (size == 0) return 0.5;
    double sum = 0.0;
    for (size_t i = 0; i < size; ++i) {
        sum += data[i];

Phi_vec(x) = Phi(mean(x))

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