Does reconciliation ever happen in LTA's like this?
Yes. Your wife, however, has to want to reconcile. Does she? An affair of this length suggests that she wants the OM too. You need her to make a firm decision and quickly.
Also, both of you wanting to reconcile does not mean that you will be successful. But, the desire to succeed is a prerequisite.
I kind of few marriage reconciliation like home construction. Yes, literally EVERYTHING can be fixed. You have to ask whether you want to fix it and if you are willing to pay the cost, but yes you can fix it. You can also sell the house and go buy a different one.
Second question: how will I know she’s on the same page as me?
This is the $1 million question. You don't. The best answer that I have is to ignore her words and pay attention to her actions. People can very easily lie and they can behave for a short period of time. But, over the long term, her 'true intentions' will come out.
She appears distraught, sure. But she continues to TT, minimize her actions (“We didn’t meet that often!” is a gem ), and is not fully transparent. We barely have NC and I strongly doubt her ability to maintain it. She’s isolated, largely friendless, and has nobody but me and OM to talk with this about.
These are all out of the cheater's handbook. If I am guessing correctly, her biggest lie right now is to herself. She thinks that she is lying to protect you, but she is actually lying to protect herself.
My guess is that penetration has happened but I don't know if it matters to you (i.e., you seem to grasp that naked wrestling is a PA that is as bad as full-on penetration). My guess is that you only know a small fraction of what has happened right now. My guess is that you will have a post in 2-4 weeks that begins with "you guys were right." Sorry to be so cynical, but I've seen this all too many times before (including from my wife!).
Where should we go from here?
The standard advice is to focus on your health right now. Eat and get in fluids as best as you can. Exercise regularly. Try to sleep.
I also recommend that you go see a doctor. You definitely need to get tested for STDs. If you are having issues with sleeping, depression, anxiety... these are all common and should be discussed with a doctor.
I recommend that you see a lawyer too. As a minimum, you need to get familiar with the laws for divorce in your state/country.
When will I start to feel safe?
Never?
I think that my marriage is reconciling exceptionally well, all things considered (caveat: I am genuinely worried that I am in false R because it is going so well). I still double check her every now and then.
MY FINAL PIECE OF ADVICE IS TO KEEP COMING TO THIS WEBSITE. We sometimes will tell you the things that you don't want to hear. But, we have your back at ALL TIMES. We can help you through just about any infidelity-related issue, ranging from PTSD to divorce to book recommendations.
I particularly recommend that you pay close attention to the folks who have more than 1000 posts (except me, perhaps). Not that people with fewer than that can't have great advice or people with that many always give good advice, but people with 1000+ posts have been here awhile. That means that, in addition to their own marriage infidelity issues, they have seen a bunch of other scenarios.