Run the star chart workflow every 4 hours

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/stars.yml

@@ -1,9 +1,8 @@
 name: stars
 on:
   schedule:
-    # Every ~2.5h (cron can't do half hours, so two interleaved 5-hour schedules)
+    # Every 4h
-    - cron: '17 0-23/5 * * *'
+    - cron: '17 */4 * * *'
-    - cron: '47 2-23/5 * * *'
   workflow_dispatch:
 permissions:
   contents: write

stars.mjs

@@ -168,7 +168,7 @@ ${isoStar(ex, ey, S)}
 `
 }
 
-// Only redraw when the star count or the UTC day changes, so the hourly job doesn't commit (and deploy) every run
+// Only redraw when the star count or the UTC day changes, so the scheduled job doesn't commit (and deploy) every run
 const key = (stars, now) => `${stars.length}@${date(now)}`
 
 export { svg, markers }