eval: submit GPQA Diamond result via PR (community badge)

.eval_results/gpqa.yaml

@@ -3,4 +3,8 @@
     task_id: gpqa_diamond
   value: 0.01
   date: "2026-06-16"
+  source:
+    url: https://huggingface.co/terry-u/my-first-model
+    name: self-reported placeholder (not a measured eval)
+    user: terry-u
   notes: "parody/practice repo — model NOT actually evaluated; value 0.01 is a placeholder set by repo owner, not a measured score"