add persistence controls for lower SSD writes

[Skater1808]

Summary

Describe the problem and the smallest change that solves it.

Validation

• make -C c check
• CUDA changes were tested with make -C c cuda-test (if applicable)
• Performance claims include hardware, commands, and repeatable measurements

Compatibility

• The default CPU build remains dependency-free
• No model files, generated binaries, or benchmark artifacts are included

[JustVugg]

Thanks for this — persistence controls for lower SSD writes is a useful feature. One process note before review: this PR targets main, but all contributions land on dev first (main is release-only and protected). Could you retarget the base branch to dev? On GitHub: Edit (top-right of the PR) → change base from main to dev. Once it's on dev I'll review it properly — the persistence/write-reduction angle is worth having, especially for the disk-streaming hosts.

[Skater1808]

Thanks, I've already changed it. If you have any further questions, I'm here.