ci: skip Release workflow for docs-only changes

Add paths-ignore for markdown files, docs/, skills/, LICENSE, and
.gitignore on push and pull_request triggers. Tag pushes are unaffected:
GitHub bypasses path filters for newly created refs.

Author: missuo

.github/workflows/release.yml

@@ -6,9 +6,23 @@ on:
       - main
     tags:
       - "v*"
+    # Docs-only pushes skip CI. Tag pushes always run: path filters are
+    # bypassed for newly created refs.
+    paths-ignore:
+      - "**.md"
+      - "docs/**"
+      - "skills/**"
+      - "LICENSE"
+      - ".gitignore"
   pull_request:
     branches:
       - main
+    paths-ignore:
+      - "**.md"
+      - "docs/**"
+      - "skills/**"
+      - "LICENSE"
+      - ".gitignore"
   workflow_dispatch:
 
 permissions: