⚡ optim: reduce duplicate CI runs on PR branches

.gitea/workflows/ci-cd.yaml

@@ -27,6 +27,12 @@ on:
     branches:
       - main
     types: [opened, synchronize, reopened, labeled]
+    # Only run PR CI if the commit doesn't already have passing branch CI
+    if: |
+      github.event_name == 'pull_request' &&
+      (github.event.action == 'opened' ||
+       github.event.action == 'synchronize' ||
+       github.event.action == 'reopened')
     paths-ignore:
       - 'README.md'
       - 'doc/**'