diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index d10949a9..65e81c25 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -10,6 +10,14 @@ updates:
       actions:
         patterns:
           - "*"
+    ignore:
+      # HOLD: github/codeql-action at v4.38.0 (SHA-pinned). v4.38.1 fails
+      # GitHub workflow-startup validation estate-wide (nexia-list#100;
+      # SHA-form re-bump bypassed versions-scoped ignores - see
+      # nexia-list#101/#104). Hold until upstream clears 4.38.1 or a
+      # newer release verifies green; revisit deliberately.
+      - dependency-name: "github/codeql-action"
+
 
   - package-ecosystem: "cargo"
     directories:
diff --git a/.github/workflows/actions.lock b/.github/workflows/actions.lock
index 368f7015..69c46ad9 100644
--- a/.github/workflows/actions.lock
+++ b/.github/workflows/actions.lock
@@ -32,7 +32,7 @@ workflows:
         - 'google/clusterfuzzlite@v1'
     '.github/workflows/codeql.yml':
         - 'actions/checkout@v7.0.1'
-        - 'github/codeql-action@1c5b675653bb5c22dbe9b12b556ec555138e09fd'
+        - 'github/codeql-action@b96794f015dfd88f77b49b1c93e0fa7110f94c63'
     '.github/workflows/dependabot-automerge.yml':
         - 'dependabot/fetch-metadata@v3.1.0'
     '.github/workflows/dogfood-gate.yml':
@@ -98,7 +98,7 @@ workflows:
         - 'actions/upload-artifact@v7.0.1'
         - 'aquasecurity/trivy-action@v0.36.0'
         - 'dtolnay/rust-toolchain@v1'
-        - 'github/codeql-action@v4.38.1'
+        - 'github/codeql-action@b96794f015dfd88f77b49b1c93e0fa7110f94c63'
         - 'gitleaks/gitleaks-action@v3.0.0'
         - 'taiki-e/install-action@v2.87.15'
         - 'trufflesecurity/trufflehog@v3.97.5'
@@ -259,12 +259,12 @@ dependencies:
         repo_id: 331103973
     'github/codeql-action@1c5b675653bb5c22dbe9b12b556ec555138e09fd':
         ref: 'v4.38.1'
-        commit: 'sha1-1c5b675653bb5c22dbe9b12b556ec555138e09fd'
+        commit: 'sha1-b96794f015dfd88f77b49b1c93e0fa7110f94c63'
         owner_id: 9919
         repo_id: 259445878
-    'github/codeql-action@v4.38.1':
-        ref: 'v4.38.1'
-        commit: 'sha1-1c5b675653bb5c22dbe9b12b556ec555138e09fd'
+    'github/codeql-action@b96794f015dfd88f77b49b1c93e0fa7110f94c63':
+        ref: 'b96794f015dfd88f77b49b1c93e0fa7110f94c63'
+        commit: 'sha1-b96794f015dfd88f77b49b1c93e0fa7110f94c63'
         owner_id: 9919
         repo_id: 259445878
     'gitleaks/gitleaks-action@v3.0.0':
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 7b0c1966..6395a96f 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -47,12 +47,12 @@ jobs:
           persist-credentials: false
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v3
+        uses: github/codeql-action/init@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4.38.0 (4.38.1 blocked estate-wide; nexia-list#100)
         with:
           languages: ${{ matrix.language }}
           build-mode: ${{ matrix.build-mode }}
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v3
+        uses: github/codeql-action/analyze@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4.38.0 (4.38.1 blocked estate-wide; nexia-list#100)
         with:
           category: "/language:${{ matrix.language }}"
diff --git a/.github/workflows/security-policy.yml b/.github/workflows/security-policy.yml
index 41b11100..78c0444f 100644
--- a/.github/workflows/security-policy.yml
+++ b/.github/workflows/security-policy.yml
@@ -150,13 +150,13 @@ jobs:
         uses: actions/checkout@v7.0.1
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v4.38.1
+        uses: github/codeql-action/init@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4.38.0 (4.38.1 blocked estate-wide; nexia-list#100)
         with:
           languages: ${{ matrix.language }}
           queries: security-extended,security-and-quality
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v4.38.1
+        uses: github/codeql-action/analyze@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4.38.0 (4.38.1 blocked estate-wide; nexia-list#100)
         with:
           category: "/language:${{matrix.language}}"
 
@@ -220,7 +220,7 @@ jobs:
           severity: 'CRITICAL,HIGH'
 
       - name: Upload Trivy scan results
-        uses: github/codeql-action/upload-sarif@v4.38.1
+        uses: github/codeql-action/upload-sarif@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4.38.0 (4.38.1 blocked estate-wide; nexia-list#100)
         if: always()
         with:
           sarif_file: 'trivy-results.sarif'
@@ -442,7 +442,7 @@ jobs:
           ignore-unfixed: true
 
       - name: Upload Trivy SARIF results
-        uses: github/codeql-action/upload-sarif@v4.38.1
+        uses: github/codeql-action/upload-sarif@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4.38.0 (4.38.1 blocked estate-wide; nexia-list#100)
         if: always()
         with:
           sarif_file: 'trivy-${{ steps.image.outputs.name }}.sarif'
@@ -582,13 +582,13 @@ jobs:
         uses: actions/checkout@v7.0.1
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v4.38.1
+        uses: github/codeql-action/init@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4.38.0 (4.38.1 blocked estate-wide; nexia-list#100)
         with:
           languages: ${{ matrix.language }}
           queries: security-extended,security-and-quality
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v4.38.1
+        uses: github/codeql-action/analyze@b96794f015dfd88f77b49b1c93e0fa7110f94c63 # v4.38.0 (4.38.1 blocked estate-wide; nexia-list#100)
         with:
           category: "/language:${{matrix.language}}"