fix(ci): graceful PHPCS skip when phpcs.xml not present

Add guard to phpcbf and phpcs strict steps: if neither phpcs.xml,
phpcs.xml.dist, nor .phpcs.xml.dist exists in the repo root, both steps
exit 0 with an info message. This prevents startup_failure on the self-test
(peptide-e2e is a Node repo with no PHPCS config) and provides clean
feedback for repos not yet configured for PHPCS.

Real PHP repos all have a phpcs.xml (prautoblogger, theme, pr-core, etc.)
so the guard is transparent for them.

Agent-Session: claude/reusable-ci-20260616

.github/workflows/ci.yml

@@ -175,6 +175,10 @@ jobs:
         # trigger a new CI run — GitHub prevents loops on bot commits.
         if: ${{ github.event_name == 'pull_request' && inputs.phpcs_autofix }}
         run: |
+          if [ ! -f phpcs.xml ] && [ ! -f phpcs.xml.dist ] && [ ! -f .phpcs.xml.dist ]; then
+            echo "No phpcs.xml — phpcbf skipped."
+            exit 0
+          fi
           phpcbf --standard=phpcs.xml \
             --extensions=php \
             --ignore=vendor/*,tests/*,node_modules/* \
@@ -191,7 +195,13 @@ jobs:
         # Runs on all events (push AND pull_request). After phpcbf has committed
         # any auto-fixable issues on PRs, only non-auto-fixable violations land
         # here. On push events phpcbf is skipped but phpcs is still strict.
+        # Guard: skip gracefully if no phpcs.xml exists (repo not yet configured).
         run: |
+          if [ ! -f phpcs.xml ] && [ ! -f phpcs.xml.dist ] && [ ! -f .phpcs.xml.dist ]; then
+            echo "No phpcs.xml / phpcs.xml.dist / .phpcs.xml.dist found — PHPCS skipped."
+            echo "Add a phpcs.xml to enable coding standards enforcement."
+            exit 0
+          fi
           phpcs --standard=phpcs.xml \
             --extensions=php \
             --ignore=vendor/*,tests/*,node_modules/* \