You have been getting some great advice.
I don't run a company but I have run and worked on a fair amount of retail.
Any chain type retail store is going to be well practiced at sticking it to the contractors. If they provide details it is best to follow them.
I can not agree with this more.
The most important thing to find out is if the GC has done many of these stores before. If they have already done a few of these they can normally help you out with any questions you may have. If it's their first one then they are in the dark just as much as you are.
I have been involved in a number of retail stores where the only 'new guy' was the GC, luckily the subs had all done the stores before.
If there is fire alarm work to do expect to have to hire the Malls FA contractor to do programing and any final connections to the malls system.
If this requires the fire alarm to be shut down the choices here are at night or higher fire dept guys to do a fire watch.
We have been hit $1,500 just to change the device descriptions on the fire alarm. (Change "Pull Station Store X" to "Pull Station Store Y" etc. )
The jobs will have to move quick, be quiet, and you will be hanging lights at the same time the floor is being done.
I like them but they can be stressful.