gram: docs

> ./openspec/changes/vue-editor-robust-implementation/notes/perf/baseline.json

{
  "capturedAt": "2026-05-12T21:21:53.450Z",
  "adapter": "react",
  "fixture": "e2e/fixtures/example-with-image.docx",
  "metrics": {
    "coldStartMs": 933,
    "inputLatencyP95Ms": 58,
    "saveMs": 5,
    "scrollFps": 120
  }
}