ci: add publish concurrency group, clean up pr-title trigger

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

Author: FBumann

.github/workflows/pr-title.yml

@@ -2,7 +2,7 @@ name: PR Title Check
 
 on:
   pull_request:
-    types: [opened, edited, synchronize, reopened]
+    types: [opened, edited, reopened]
 
 jobs:
   validate:

.github/workflows/publish.yaml

@@ -9,6 +9,10 @@ on:
         required: true
         type: string
 
+concurrency:
+  group: publish-${{ inputs.tag || github.ref_name }}
+  cancel-in-progress: false
+
 permissions:
   contents: write
   id-token: write