chore(highcharts): add metadata for scatter-lag

Author: github-actions[bot]

plots/scatter-lag/metadata/highcharts.yaml

@@ -0,0 +1,18 @@
+# Per-library metadata for highcharts implementation of scatter-lag
+# Auto-generated by impl-generate.yml
+
+library: highcharts
+specification_id: scatter-lag
+created: '2026-04-12T18:13:46Z'
+updated: '2026-04-12T18:13:46Z'
+generated_by: claude-opus-4-5-20251101
+workflow_run: 24313009902
+issue: 5251
+python_version: 3.14.3
+library_version: unknown
+preview_url: https://storage.googleapis.com/pyplots-images/plots/scatter-lag/highcharts/plot.png
+preview_html: https://storage.googleapis.com/pyplots-images/plots/scatter-lag/highcharts/plot.html
+quality_score: null
+review:
+  strengths: []
+  weaknesses: []