ci(security): pin ci.yml + deploy-website.yml actions to SHAs (CICD-001)

Completes the GitHub Actions SHA-pinning started for release.yml (CICD-002):
all actions in ci.yml and deploy-website.yml are now pinned to full-length
commit SHAs (version retained in a trailing comment). SHAs resolved via
git ls-remote on 2026-06-02.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: ersinkoc

.github/workflows/ci.yml

@@ -28,18 +28,18 @@ jobs:
         node-version: [22]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1 # v4
 
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: ${{ matrix.node-version }}
           cache: 'pnpm'
 
       - name: Cache Turbo
-        uses: actions/cache@v4
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
         with:
           path: .turbo
           key: turbo-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}-${{ github.sha }}
@@ -102,12 +102,12 @@ jobs:
           --health-retries 5
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1 # v4
 
       - name: Use Node.js 22
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: 22
           cache: 'pnpm'

.github/workflows/deploy-website.yml

@@ -25,10 +25,10 @@ jobs:
         working-directory: website
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: '22'
           cache: 'npm'
@@ -41,10 +41,10 @@ jobs:
         run: npm run build
 
       - name: Setup Pages
-        uses: actions/configure-pages@v5
+        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3
         with:
           path: website/dist
 
@@ -57,4 +57,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4