Where in the CHI? There hasn't been a directive in General Conference to the members...in fact, Monson made a point of accusing apostates of being "offended" or wanting to sin, etc. etc. which could be taken as permission to shun.
Direct ORDER? The LDS Church is not the Army.
The general authorities tend not to give "direct orders" to the Church. (I cannot remember them ever doing so, unless you consider a call to repentance a direct order.) They do preach, teach, counsel, advise, encourage, exhort, invite, and so forth. But they do not say "I ORDER you to _____________ ."
I posted several excerpts from general authorities which leave little room for the practice of shunning. I can probably find many more; but none of them would be worded as direct ORDERS to the Church.
What about the local authorities of the Church? They are expected to follow the policies contained in the Church Handbook of Instructions. As I recall, the Handbook sets out clear directives on how church discipline is to be administered. It contains no provision for shunning anyone.
Do the members practice shunning without official sanction? Perhaps. But I have never heard anyone suggest it be done. No doubt some individuals choose to cut their ties with persons they find disagreeable; however, that does not fit the definitions of shunning that both you and I posted earlier.
One more thing. Inactive or former members of the Church have often complained to me that the members will not leave them alone. It is not unusual for inactive members to request that they not be visited. I daresay most bishops honor such requests. Again, that does not fit the definitions of shunning that both you and I posted earlier.