chore(matplotlib): add metadata for scatter-basic

Author: github-actions[bot]

plots/scatter-basic/metadata/matplotlib.yaml

@@ -0,0 +1,18 @@
+# Per-library metadata for matplotlib implementation of scatter-basic
+# Auto-generated by impl-generate.yml
+
+library: matplotlib
+specification_id: scatter-basic
+
+preview_url: https://storage.googleapis.com/pyplots-images/plots/scatter-basic/matplotlib/plot.png
+preview_html: null
+
+current:
+  version: 0
+  generated_at: 2025-12-11T22:54:42Z
+  generated_by: claude-opus-4-5-20251101
+  workflow_run: 20150014768
+  issue: 611
+  quality_score: null  # Updated after review
+
+history: []