ci: adopt estate reusable CI caller v2.5.0

- ci.yml replaced with thin caller (tests: stubs, has_js: true)
- security-audit.yml extracted as standalone workflow
- deploy.yml: contents write permission for phpcbf token scope
- composer.json: pin scripts to vendor/bin/ paths
- phpunit.xml.dist: PHPUnit 9.6 XSD ref; drop deprecated convert* attrs
- CHANGELOG.md: created; version bump 2.4.1 to 2.5.0

Agent-Session: claude/adopt-ci-20260616

.github/workflows/security-audit.yml

@@ -0,0 +1,58 @@
+##
+# Security audit — peptide-news-plugin
+#
+# Standalone workflow kept separate from the estate CI caller so it can evolve
+# independently and run on every PR without being bundled into the reusable pipeline.
+# Checks for: unescaped SQL, eval(), base64_decode(), file_get_contents with user input.
+##
+name: Security Audit
+
+on:
+  pull_request: {}
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  security-audit:
+    name: Security Audit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check for common PHP security issues
+        run: |
+          echo ":: Checking for direct SQL queries without prepare..."
+          # Exclude uninstall.php (DROP TABLE is standard WP pattern), activator (table DDL),
+          # and logger (TRUNCATE) — these use $wpdb->prefix which is safe internal state.
+          if grep -r "query\s*(\s*['\"].*\$" --include="*.php" --exclude-dir=vendor . 2>/dev/null \
+            | grep -v "\$wpdb->prepare" \
+            | grep -v "uninstall\.php" \
+            | grep -v "class-peptide-news-activator\.php" \
+            | grep -v "class-peptide-news-logger\.php" \
+            | grep -v "DROP TABLE" \
+            | grep -v "TRUNCATE" \
+            && [ ${PIPESTATUS[0]} -eq 0 ]; then
+            echo "WARNING: Found potential unescaped SQL queries. Use wpdb->prepare() for all dynamic SQL."
+            exit 1
+          fi
+
+          echo ":: Checking for eval() usage..."
+          if grep -r "eval\s*(" --include="*.php" --exclude-dir=vendor . 2>/dev/null; then
+            echo "ERROR: eval() found. This is a critical security risk."
+            exit 1
+          fi
+
+          echo ":: Checking for base64_decode without validation..."
+          if grep -r "base64_decode\s*(" --include="*.php" --exclude-dir=vendor . 2>/dev/null; then
+            echo "WARNING: Found base64_decode(). Ensure the input is properly validated."
+          fi
+
+          echo ":: Checking for file_get_contents with user input..."
+          if grep -r "file_get_contents\s*(\s*\$" --include="*.php" --exclude-dir=vendor . 2>/dev/null; then
+            echo "WARNING: Found file_get_contents with variable. Ensure input is validated and restricted."
+          fi
+
+          echo "All security checks passed."