after all that work done I wouldn't risk re-using the head bolts they are fairly cheap anyways. I believe they are torque to yield head bolts and should be replaced, so one yeah here.
Yes you should always replace head bolts. Whether people do or not is a different story. Head bolts are stretch to yield. This means they are one time use. Like above i also recommend ARP studs or bolts if the budget allows.
I think this has been discussed and consensus was that Toyota bolts are not stretch to yield bolts. And Haynes did not call for it when I did my head gaskets.
I have never replaced bolts, on my 4Runner, FJ40 or Jeep when I did work. No issues.
To each his own.