Beside the question if or not the curfew was declared with the right anthority and procedure, if we assume your points are correct (I am not an law expert, so not making conclusion, but asking questions):
A. How many persons shall be arrested (based on your point 2) during the 1989 curfew, among them, how many of them end up been killed?
B. How many took voilent, armed, military actions and end up been killed (based on yr point3). How many of these happened before the army first open fire (~10pm on June 3rd?) and how many happened after that ?
C. How was voilent, armed, military actions defined?
D. Did the governoment and the PLA release facts including number and names of death to answer the question above, any files that document the reason of EACH death: what / when / where his/her action triggered the army to open fire on him/her (or a judge to sentance the death penalty). Because the scale of the event, a few death may be difficult to track back, but the majority of death probably could be tracked back with evidence (if he/she attacked the army, what weapon was used, etc). Was there any effort to put together and keep records of such files and make the files public for as many as possible of the life died?
Life and death is serious, if not THE seriousest line in human societies. It is hard to image a human life can be taken without documentation (judge sentence before execution, or at least, make best effort to pull together a file afterward in the case of curfew to justify the on-the-spot execution) of the reason and evidence to do so. Errors in arrest can be corrected, you can release the person been arrested mistakenly. Errors in death is not reveriable - once someone was killed, there is no way to correct if that was a mistake.
2. anyone desorbey the order of curfew will be arrested, and afterwords,,,,,
3. anyone take violent, armed, military actions against the curfew order, and attack the military or law enforcement personel will and can be excuted / killed at the spot, no any other procedures need to be pre-proceeded,
