auto-round

a559dc82 - chore: drop dev handoff and generated images from bf16 sparse branch

chore: drop dev handoff and generated images from bf16 sparse branch The bf16 sparse feature is source-only for the formal PR: remove the dev handoff note (no _CN counterpart) and the generated benchmark/render PNGs. Co-Authored-By: Claude <noreply@anthropic.com>