Realtor (listing / buyers) agents would not have knowledge of this
Lynn911 Dallas Realtor & Consultant, Loan Officer, Credit Repair Advisor
The Michael Group - Dallas Business Journal Top Ranked Realtors
Contact Attorney post haste and see about a solution. Best of luck.
Best of luck and sorry about your situation
It does seem as if your inspector should have caught the roof issue and potentially saw signs of abnormal movement in the slab as well. Typically they aren't responsible for foundations but can spot signs of problems. Was your inspector TREC licensed? I assume that both you and your agent were counting on the inspector inform you of any problems.
Bottom line is that you need to get to a real estate attorney and take in all documentation (including this roofers report) along with pictures of the house. I would call tomorrow and make an appointment.