feat(site): plot CPU engineering samples across the growth timeline

Reads the satellite repo's history.json and adds its record count as of
each point's date, so it grows along the chart instead of appearing as
one step at the newest point. Without history.json the chart is as before.

Refs #19

Author: Seungpyo1007

site/src/scripts/techapi.js

@@ -444,6 +444,20 @@ function countUp(node, target, opts = {}) {
     if (!points || !points.length) points = await pointsFromGitHubApi();
     if (!points.length) throw new Error("empty history");
 
+    // Add each satellite's count as of every point's date (its own history.json).
+    const es = await fetch("https://gettechapi.github.io/cpu-engineering-samples/history.json")
+      .then((r) => (r.ok ? r.json() : Promise.reject()))
+      .then((d) => (d.points || []).map((p) => ({ t: new Date(p.date).getTime(), count: p.count })))
+      .catch(() => []);
+    if (es.length) {
+      for (const point of points) {
+        const asOf = es.filter((p) => p.t <= point.dateValue).pop();
+        if (!asOf) continue;
+        point.rows = [...point.rows, { key: "cpu_es", count: asOf.count }];
+        point.total += asOf.count;
+      }
+    }
+
     const currentTotal = totalRecords(currentManifest);
     const latest = points[points.length - 1];
     if (latest.total !== currentTotal) {