Soundproofing a party wall from footfall

We recently remodeled our bathroom, which was a very messy process with lots of plaster dust. I had been told by an inspector previous to the remodel that the walls were just normal animal-hair plaster, and not a concern. After the remodel was complete, I started getting anxiety about it, and decided to have some samples in my house tested just for future knowledge, and if we remodel anything else. I sent out various samples from around the house, plaster walls, plaster ceilings, attic insulation, and textured ceiling paint (NVLAP accredited lab). All of the plaster and insulation came back negative, but the ceiling sample came back positive for 2% Anthophyllite...and now I'm freaking out a bit. I spoke with the lab on a consultation call, and they said the ceiling should not be a concern as long as it's not disturbed, and we could plaster/paint over it to encapsulate it. I told the person that have cracks in that part of the ceiling though, and if we should be concerned. She said we should probably have an air quality test done. So now I'm in a panic to test our air. This ceiling is only in one hallway (other ceiling samples tested negative), but it is the main hallway of the house . Dust and debris are not falling from the ceiling, and we never touch it...but there are some pretty big cracks in the paint that reveal the plaster layers underneath it. We have been living in this house for 5 years now, and the ceiling has been in basically the same condition the entire time. I understand all forms of asbestos are toxic, and there is no acceptable level. But I'm looking for advice on how concerned I should be about this level of exposure. I don't plan on removing the ceiling at any point, and just want to encapsulate it. Is it enough to just paint it? Should I use a roller or a sprayer? Should I plaster the cracks first? If I use plaster, is there a concern of disturbing the paint as I apply it? Obviously I won't be sanding or cutting it...but will incidental contact with wet plaster do anything? Will a strong breeze through the hall do anything? Any information is appreciated.

Hello all. Our current stairwell to our basement is nothing special and is only half done or so. I am looking to change that. Currently, the poured walls are exposed but above those (being the kitchen and garage walls) are walled off, insulated and paneled. (albeit old) I am looking to take down the paneling, probably install some new insulation and wall it all off so that it's nice and clean, and flush. One problem though. The stairwell is already some what narrow, or rather average sized without me framing in walls. What can I do about this? Would I throw up foam board insulation and then some thin paneling over that? I don't mind the paneled look as long as it's a more updated look. Pictures attached for some reference of what I am describing. Thanks! Edit: Fixing the stairs and replacing the ceiling will be another project. ;)