ci: drop temporary smoke-test branch hook (release is tag-driven)

Author: moccch

.github/workflows/release.yml

@@ -25,14 +25,7 @@ name: release
 on:
   push:
     tags: ['v*']
-    # TEMPORARY (smoke-test phase): auto-run on every push to v0.1.0 so we
-    # don't need the "Run workflow" UI button (which is only visible when
-    # the workflow file exists on the default branch). REMOVE this
-    # `branches:` block before cutting the real v0.1.0 tag — otherwise
-    # every commit on the branch will burn ~1–2h of CI time.
-    branches: ['v0.1.0']
-  workflow_dispatch:           # manual trigger from the Actions tab (only
-                               # shown once this workflow lands on `main`)
+  workflow_dispatch:           # manual trigger from the Actions tab
 
 env:
   RAPIDS_CUDA_VERSION: "12.9"