As stated I'm afraid this is not possible.
Deciding whether or not an interaction is flirting is a partly subjective notion: flirting is showing interest in deeper relationship, how that is done could be left to evaluation of behavioral cues, which also know cultural (and, most likely, individual) variations.
Flirting usually involves speaking and behaving in a way that suggests a mildly greater intimacy than the actual relationship between the parties would justify, though within the rules of social etiquette, which generally disapproves of a direct expression of sexual interest in the given setting. This may be accomplished by communicating a sense of playfulness or irony. Double entendres (where one meaning is more formally appropriate, and another more suggestive) may be used. Body language can include flicking the hair, eye contact, brief touching, open stances, proximity, and other gestures. Flirting may be done in an under-exaggerated, shy or frivolous style.
(Empathis mine)
Trying to frame in objective terms what you can or can't do, when flirting can consist in double-meaning sentences, body language and attitude that are tolerated by the etiquette, can be quite complicated.
Being in a relationship I can say there are things you could do and promise to your wife to ease possible conflicts: wearing your wedding ring will especially address the issue of making your engagement clear, as it serves exactly that purpose;
A wedding ring or wedding band is a finger ring that indicates that its wearer is married.
In the meantime you aren't married, you could mention engagement verbally, although when you could so is not always clear.
If you feel this is reasonable you can also promise to decline invitations outside work setting when your wife is not invited and generally speaking promise her you would not do anything secret to her. This is something I did in my couple as I feel secrecy is not necessary to me.
We come to the point where you can't do much more. You could promise every kind of added security, gps tracking and whatnot, the cold truth is that unless you're made prisoner and locked down there will always be opportunity for you to cheat. Because of how anxiety works, it could be in the long term reinforced by "security measures", which is why I would definitely argue against agreeing on them.
As your anxiety increases, you try to reduce the anxiety and prevent what you think might happen by avoiding the situation.
If you cannot avoid the situation, then you use subtle avoidance to reduce the anxiety. For example, you may use certain rituals, like standing close to a door to make a quick escape.
In some way, you might feel less anxious in the short term when you engage in avoidance behaviours. You may take tranquillisers to deal with distressing situations.
However, when you have to deal with the situation the next time, you are less confident that you can cope with it because you avoided it the last time or become dependent on safety behaviours. So you feel more anxious.
The more your wife has to trust your word, the sooner she may realize you can be trusted.
One important step in reversing the anxiety cycle is gradually confronting feared situations.
If you do this, it will lead to an improved sense of confidence, which will help reduce your anxiety and allow you to go into situations that are important to you.
