I also had a similar experience in one company. My candidature was not approved for the desired position, I was told that they would keep my resume and will contact me later. A month later, they called me and offered to participate in the competition for another position. And I faced a failure again. So they promised me again that they would contact me later when a suitable vacancy appeared. This story never ended, I found a job elsewhere.
I have to admit, at first glance your situation looks weird. Alternatively, I can assume that a Head expected not only a summary, but also a cover-letter:
https://federalresumeguide.com/how-to-write-a-cover-letter-for-federal-jobs/ Some companies give meaning to this, and cover letter for federal job is a must, I assure you.