ci: add perf prefix to PR title checker

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

Author: bartlomieju

.github/workflows/ci.yml

@@ -15,8 +15,8 @@ jobs:
         env:
           TITLE: ${{ github.event.pull_request.title }}
         run: |
-          if ! echo "$TITLE" | grep -qP '^(chore|ci|docs|feat|fix|refactor|test):'; then
-            echo "::error::PR title must start with chore:, ci:, docs:, feat:, fix:, refactor: or test:"
+          if ! echo "$TITLE" | grep -qP '^(chore|ci|docs|feat|fix|perf|refactor|test):'; then
+            echo "::error::PR title must start with chore:, ci:, docs:, feat:, fix:, perf:, refactor: or test:"
             exit 1
           fi