Hello Sierrasparky,
You do seem to be concerned with this issue. I can understand why. You want to do it right the first time and you also have to be competitive with others who may not care.
Can I assume that you have ready access to parts to perform some testing on your own? If you can find the time it could help give you a sense of security for future bids.
Try running several dimmers as parallel loads on the same AFCI breaker. Depending upon the number of dimmers you might have available try 3 to 5 dimmers , each with 300 -350 watts load on them. Make for a total load on the circuit of 900 - 1750 watts (20A circuit).
Very each dimmer from full ON to various dim levels. Try different combinations of intensities on each dimmer. See if you can force the AFCI to trip. Try this with your preferred brand of AFCI that you might have readily available to you. If at all possible try other manufacturers in the same test setup to compare.
The results could help you feel more at ease about future bids/installs. Depending upon the results you might find that you want to avoid certain brands.
I understand that it may be difficult to find the time and/or resources to do this but if you can it may be very worthwhile to you.