// Optional proximity connectivity engine (sidecar). Best-effort; no-ops by default.
#include "DeterministicLayout.h"
#include "SpatialHash.h"
#include "ProximityConfig.h"
#include "ProximityEngine.h"
#include "Region.h"

namespace grownet {

static inline double euclidean(double ax, double ay, double az, double bx, double by, double bz) {
    const double dx = ax - bx; const double dy = ay - by; const double dz = az - bz;
    return std::sqrt(dx*dx + dy*dy + dz*dz);
}

int ProximityEngine::Apply(Region& /*region*/, const ProximityConfig& /*cfg*/) {
    // Intentionally a stub for now; hook is integrated into Region ticks.
    // Implement STEP/LINEAR/LOGISTIC here as needed.
    return 0;
}

} // namespace grownet
