Bump neutral hold gains to 10x for free-hanging calibration

5x wasn't enough to overcome ankle parallel linkage friction.
Robot is harness-supported so higher gains are safe.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gear_sonic_deploy/src/g1/g1_deploy_onnx_ref/src/g1_deploy_onnx_ref.cpp

@@ -2829,9 +2829,10 @@ class G1Deploy {
       MotorCommand motor_command_tmp;
 
       // Neutral hold mode: bypass NN, command default angles directly (key 'n')
-      // Uses 5x gains for stiff hold — useful for visual joint calibration.
+      // Uses 10x gains for stiff hold — useful for visual joint calibration.
+      // Robot must be in test harness (free-hanging) for this mode.
       if (g_neutral_hold_mode.load()) {
-        constexpr float neutral_gain_mult = 5.0f;
+        constexpr float neutral_gain_mult = 10.0f;
         for (int i = 0; i < G1_NUM_MOTOR; i++) {
           motor_command_tmp.q_target.at(i) = static_cast<float>(default_angles[i]);
           motor_command_tmp.tau_ff.at(i) = 0.0;