#1456 bench: Flash Next variant tool-eval campaign

本文

## Summary
Draft benchmark campaign for ISTA and Swift 1.5 Q2_0/IQ2_XS. ISTA Q2_0: 80/100 short, 83/100 standard. Q8 is running on three P4s.

## What changed
Progress matrix with blank pending scores, raw traces, resource samples, exact settings and pinned model hashes.

## Extra Notes
Please create as a draft. No engine changes. Required variants are still being tested. Different hardware and background transfers are documented. Benchmark integration fix is a separate PR.