fix(ci): trigger release workflow on version tags only

Only publish when tags matching iab-*@* are pushed, aligning with
the prep-release flow which creates annotated tags per package.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hogekai

.github/workflows/release.yml

@@ -2,9 +2,8 @@ name: Release
 
 on:
   push:
-    branches: [main]
-
-concurrency: ${{ github.workflow }}-${{ github.ref }}
+    tags:
+      - "iab-*@*"
 
 jobs:
   release: