Fix new compiler errors and draw gpu benchmark crash

[bgreni]

• Spruced things up to run on MAX 26.1 nightly
• Seems the reason for the crashing GPU test is the "center" tensor actually needs to be allocated on the host side since it's accessed at the top of the DrawCircle.execute method before the GPU work begins

[BradLarson]

Cool, thanks! Surprised that there are that few breaking changes in the recent nightlies, given what we've had to update in the GPU puzzles.