security: harden CI against supply-chain attacks (#20476)

- Pin all third-party actions to SHA
- Gate claude.yml triggers to internal authors with Harden-Runner egress
audit
- Ignore fork-PR lifecycle scripts
- Narrow cross-repo dispatch payloads
- Add 7d npm release-age gate
- Add CODEOWNERS on .github/** and .yarnrc.yml

---------

Co-authored-by: prastoin <paul@twenty.com>

.github/workflows/ci-front-component-renderer.yaml

@@ -32,12 +32,8 @@ jobs:
       matrix:
         task: [build, typecheck, lint]
     steps:
-      - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.11.0
-        with:
-          access_token: ${{ github.token }}
       - name: Fetch custom Github Actions and base branch history
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:
           fetch-depth: 10
       - name: Install dependencies
@@ -50,12 +46,8 @@ jobs:
     timeout-minutes: 30
     runs-on: ubuntu-latest
     steps:
-      - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.11.0
-        with:
-          access_token: ${{ github.token }}
       - name: Fetch custom Github Actions and base branch history
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:
           fetch-depth: 10
       - name: Install dependencies
@@ -63,7 +55,7 @@ jobs:
       - name: Build storybook
         run: npx nx storybook:build twenty-front-component-renderer
       - name: Upload storybook build
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
           name: storybook-twenty-front-component-renderer
           path: packages/twenty-front-component-renderer/storybook-static
@@ -76,7 +68,7 @@ jobs:
       STORYBOOK_URL: http://localhost:6008
     steps:
       - name: Fetch custom Github Actions and base branch history
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:
           fetch-depth: 10
       - name: Install dependencies
@@ -84,7 +76,7 @@ jobs:
       - name: Build dependencies
         run: npx nx build twenty-sdk
       - name: Download storybook build
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:
           name: storybook-twenty-front-component-renderer
           path: packages/twenty-front-component-renderer/storybook-static