prepare full KVM native CI candidate with verified NoAVX boot injection

.gitea/workflows/pr-push-build-and-test.yaml

@@ -3,6 +3,9 @@ name: PR and Push Build/Test
 on:
   pull_request:
   push:
+    # The isolated NoAVX candidate uses the existing manual native workflow.
+    branches-ignore:
+      - codex/macos-native-full-kvm-noavx
   workflow_dispatch:
 
 jobs: