Do the conditions of capacity for polygyny apply to marrying a woman who insists on marriage despite knowing of an illness that prevents the fulfillment of marital duties, with her desire being solely for procreation?

The temptation of women is one of the greatest and most dangerous trials. What you mentioned about the strong love between you and your female colleague at work is wrong, and you both must repent and distance yourselves from it. As for your coronary artery insufficiency and its effect on marital capacity, this does not affect the validity of the marriage, because the ability to have intercourse is not a condition for the validity of the marriage. Rather, it grants the wife the option to annul the marriage if the husband is absolutely unable to have intercourse, and her option is forfeited if he has intercourse even once. If we assume there was another defect in you and the wife accepted it, there is no sin upon you in marrying her.