I have pulled on the control arms (callout #4 in the 2nd TIS picture per my original post) and cannot get any relative movement. I have inspected the rubber bushing where it mounts to the sub-frame carrier, no cracks. There are no tears in the rubber boot for where it attaches to the swivel bearing (callout #6)

No poping is felt through the steering wheel.

Several people have used the word "control arm". Note this is not item #9, which is the tension strut (or thrust arm). I have already replaced the large press-in bushing for the left and right side tension strut. Its rubber boot is also in good shape, but the ball joint could still be bad.

Considering the clunking can be replicated while the vehicle is not moving, it seems the only parts moving are the three ball joints (control arm, tension strut and steering tie rod) on the swivel bearing, the outboard CV joint, and the strut bearing above the large coil spring.
Big "J" has a valid point that metal shrinks in cold weather... perhaps it is just the wheel bearing is able to slide in the swivel bearing like the SIB mentions? I don't want to replace this bearing, but I can't picture the other items making this sliding metal noise...

I haven't been impressed with my local BMW Dealer's Service Department, but it may be worth the time & $.

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2010 X5 3.5d: SOLD, but miss the torque...
2004 X5 4.4i: SOLD, but served us well