diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 0000000..8f787bc
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,40 @@
+name: CodeQL Analysis
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: "30 5 * * 1"  # Monday 05:30 UTC
+
+concurrency:
+  group: codeql-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  # CONTRACT: org ruleset requires this exact check name 'codeql'
+  # Do NOT add a 'name:' override or matrix strategy
+  codeql:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    permissions:
+      actions: read
+      security-events: write
+      contents: read
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@0d579ffd059c29b07949a3cce3983f0780820c98  # v4.32.6
+        with:
+          languages: javascript-typescript
+          queries: +security-extended
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@0d579ffd059c29b07949a3cce3983f0780820c98  # v4.32.6
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@0d579ffd059c29b07949a3cce3983f0780820c98  # v4.32.6
+        with:
+          category: "/language:javascript-typescript"
diff --git a/.github/workflows/lean_action_ci.yml b/.github/workflows/lean_action_ci.yml
index 9f3561f..eca64ec 100644
--- a/.github/workflows/lean_action_ci.yml
+++ b/.github/workflows/lean_action_ci.yml
@@ -5,10 +5,17 @@ on:
   pull_request:
   workflow_dispatch:
 
+permissions: {}
+
+concurrency:
+  group: lean-ci-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 env:
   ELAN_HOME: /home/runner/.elan
 
 jobs:
+  # CONTRACT: org ruleset requires this exact check name 'build'
   build:
     runs-on: ubuntu-latest
     permissions:
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
new file mode 100644
index 0000000..91a81ae
--- /dev/null
+++ b/.github/workflows/scorecard.yml
@@ -0,0 +1,24 @@
+name: OpenSSF Scorecard
+
+on:
+  push:
+    branches: [main]
+  schedule:
+    - cron: "15 6 * * 1"  # Monday 06:15 UTC
+  workflow_dispatch:
+
+permissions: {}
+
+concurrency:
+  group: scorecard
+  cancel-in-progress: false
+
+jobs:
+  scorecard:
+    uses: Project-Navi/.github/.github/workflows/scorecard.yml@6c4c2d8f200b1b9c3bd651ebc297425e45d5934e
+    permissions:
+      contents: read
+      security-events: write
+      id-token: write
+      actions: read
+    secrets: inherit