side-by-side 2

Renders edit and write tool calls as always-expanded side-by-side diffs styled like git diff, with optional syntax coloring and word-level highlighting.

Side-by-side model comparison for the DeepSeek Harness Web UI: send one prompt to 2–4 models in sibling sessions forked from the current one, watch the answers stream in columns (tabs on phones) with latency, time to first token, tokens, and cost, then co