Commit the vanilla baseline result file (13/48) the Quickstart references #5

The Quickstart's vanilla step says 'Expected: 13/48' but no results/vanilla*.json is committed, so the number isn't reproducible-verifiable the way the ACP runner's is (results/acp_api-v0.1.0-live.json). Run the vanilla runner once and commit the artifact; link it from the Quickstart like the ACP result.