fix(compliance): 2026-05-11 audit findings for .github repo

.github/workflows/ci.yml

@@ -80,6 +80,26 @@ jobs:
             echo "No shell scripts found — skipping"
           fi
 
+  secret-scan:
+    name: Secret scan (gitleaks)
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - name: Checkout (full history)
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+
+      - name: Run gitleaks
+        uses: gitleaks/gitleaks-action@ff98106e4c7b2bc287b24eaf42907196329070c7 # v2.3.9
+        with:
+          args: detect --source . --redact --verbose --exit-code 1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITLEAKS_LICENSE: ${{ secrets.GITLEAKS_LICENSE }}
+
   agent-security:
     name: Agent Security Scan
     runs-on: ubuntu-latest