- Add experiments/dsv4_h200_sglang (config, server start, orchestrator, parser, README)
- Fix start_server.sh to wait for HTTP 200 via curl --fail instead of treating 503 as ready
- Add H200 SGLang baseline to root README and update .gitignore for per-run raw_outputs/logs
- Remove stale experiments/dsv4_h200_dspark/DSPARK_FIX_PR_PREP.md