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## Summary Add historical trend visualization (ASCII sparklines + directional arrows) to the performance PR report, showing how each metric has moved over recent commits on main. ## Changes - **What**: New `sparkline()`, `trendDirection()`, `trendArrow()` functions in `perf-stats.ts`. New collapsible "Trend" section in the perf report showing per-metric sparklines, direction indicators, and latest values. CI workflow updated to download historical data from the `perf-data` orphan branch and switched to `setup-frontend` action with `pnpm exec tsx`. ## Review Focus - The trend section only renders when ≥3 historical data points exist (gracefully absent otherwise) - `trendDirection()` uses a split-half mean comparison with ±10% threshold — review whether this sensitivity is appropriate - The `git archive` step in `pr-perf-report.yaml` is idempotent and fails silently if no perf-history data exists yet on the perf-data branch ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-9939-feat-add-trend-visualization-with-sparklines-to-perf-report-3246d73d36508125a6fcc39612f850fe) by [Unito](https://www.unito.io) --------- Co-authored-by: GitHub Action <action@github.com>