feat: benchmark Operations Center with live progress dashboard

- Redesign generate-report.cjs as a multi-view Operations Center
  - Three tabs: Performance, Quality, Vision
  - Run picker sidebar with model-grouped history + multi-select
  - Comparison tables across selected runs
  - Export to Markdown for community sharing
- Add live progress mode (auto-refresh + LIVE banner)
  - Intermediate saves after each suite completes
  - Browser auto-opens with pulsing progress indicator
  - Auto-refreshes every 5s during benchmark run
- Save VLM fixture metadata (filename, response, prompt) per test
- Embed all data inline for fully self-contained HTML

Author: solderzzc