That is, fighters who always escort the carrier and cannot roam at all.
All we have is the cheap option, Mining Pods (0 OP), and the premium option, Xyphos (18 OP). There is no midgrade option (8-10 OP). Also, of the two options we have, the only option usable by automated ships is Mining Pods.
Escort fighters are nice for warships or battlecarriers who want auxiliary weapons that orbit or hover around the mothership.
The Regroup/Engage toggle is no good for AI ships because if the fighters can roam, AI will always use Engage to seek and destroy enemies, which blocks zero-flux speed boost, which is bad for warships that happen to have bay or two as a bonus like Odyssey, or anyone with Converted Hangar. Carrier with escort-only fighters will briefly turn on Engage but then quickly toggle it back to Regroup, which will let the ship have zero-flux bonus at least some of the time.