Pin GitHub Actions to commit SHAs

Replace mutable tag references with immutable commit SHAs
for supply chain security. Tags preserved as comments.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: collinmcneese

.github/workflows/ci.yml

@@ -13,9 +13,9 @@
         matrix:
           node-version: [20.x]
       steps:
-        - uses: actions/checkout@v6
+        - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         - name: Use Node.js ${{ matrix.node-version }}
-          uses: actions/setup-node@v6
+          uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
           with:
             node-version: ${{ matrix.node-version }}
         - name: npm install

.github/workflows/eslint.yml

@@ -28,7 +28,7 @@ jobs:
       actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
     steps:
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Install ESLint Dependencies
         run: |
@@ -44,7 +44,7 @@ jobs:
         continue-on-error: true
 
       - name: Upload analysis results to GitHub
-        uses: github/codeql-action/upload-sarif@v4
+        uses: github/codeql-action/upload-sarif@7211b7c8077ea37d8641b6271f6a365a22a5fbfa # v4
         with:
           sarif_file: eslint-results.sarif
           wait-for-processing: true

.github/workflows/watcher.yml

@@ -27,9 +27,9 @@ jobs:
       GHWATCHER_ENABLE_DEPENDABOT: true
       GHWATCHER_BASEURL: https://api.github.com
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Use Node.js 24.x
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
         with:
           node-version: 24
       - name: npm setup