diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index b6fa1c38..681b704c 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -27,16 +27,16 @@ jobs:
             build-mode: none
     steps:
       - name: Checkout
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v4.38.0
+        uses: github/codeql-action/init@b96794f015dfd88f77b49b1c93e0fa7110f94c63  # v4.38.0
         with:
           languages: ${{ matrix.language }}
           build-mode: ${{ matrix.build-mode }}
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v4.38.0
+        uses: github/codeql-action/analyze@b96794f015dfd88f77b49b1c93e0fa7110f94c63  # v4.38.0
         with:
           category: "/language:${{ matrix.language }}"
 
diff --git a/.github/workflows/dependabot-automerge.yml b/.github/workflows/dependabot-automerge.yml
index 5d34a84b..ee066a15 100644
--- a/.github/workflows/dependabot-automerge.yml
+++ b/.github/workflows/dependabot-automerge.yml
@@ -56,7 +56,7 @@ jobs:
     steps:
       - name: Fetch Dependabot metadata
         id: meta
-        uses: dependabot/fetch-metadata@v3.1.0
+        uses: dependabot/fetch-metadata@25dd0e34f4fe68f24cc83900b1fe3fe149efef98  # v3.1.0
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
 
diff --git a/.github/workflows/dogfood-gate.yml b/.github/workflows/dogfood-gate.yml
index b40d9638..668a1df3 100644
--- a/.github/workflows/dogfood-gate.yml
+++ b/.github/workflows/dogfood-gate.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Check for A2ML files
         id: detect
@@ -40,7 +40,7 @@ jobs:
 
       - name: Validate A2ML manifests
         if: steps.detect.outputs.count > 0
-        uses: hyperpolymath/a2ml-ecosystem/validate-action@main
+        uses: hyperpolymath/a2ml-ecosystem/validate-action@ed83d6927e8fb21431e403dbf6d7a4af96772746  # main
         with:
           path: '.'
           strict: 'false'
@@ -71,7 +71,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Check for K9 files
         id: detect
@@ -88,7 +88,7 @@ jobs:
 
       - name: Validate K9 contracts
         if: steps.detect.outputs.k9_count > 0
-        uses: hyperpolymath/k9-ecosystem/validate-action@main
+        uses: hyperpolymath/k9-ecosystem/validate-action@c1a34884054fabf0e9de81dbf68f4ba7874e85f1  # main
         with:
           path: '.'
           strict: 'false'
@@ -120,7 +120,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Scan for invisible characters
         id: lint
@@ -184,7 +184,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Check for Groove manifest
         id: groove
@@ -244,7 +244,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Generate dogfooding scorecard
         run: |
diff --git a/.github/workflows/guix-nix-policy.yml b/.github/workflows/guix-nix-policy.yml
index a2bf386c..15a02f46 100644
--- a/.github/workflows/guix-nix-policy.yml
+++ b/.github/workflows/guix-nix-policy.yml
@@ -21,7 +21,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v7.0.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
       - name: Enforce Guix primary / Nix fallback
         run: |
           # Check for package manager files
diff --git a/.github/workflows/index-freshness.yml b/.github/workflows/index-freshness.yml
index 804a774b..4d22ef50 100644
--- a/.github/workflows/index-freshness.yml
+++ b/.github/workflows/index-freshness.yml
@@ -36,7 +36,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout (with history; regen-index needs git log on scans/)
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/ingest.yml b/.github/workflows/ingest.yml
index 76a93156..ec3de96e 100644
--- a/.github/workflows/ingest.yml
+++ b/.github/workflows/ingest.yml
@@ -29,7 +29,7 @@ jobs:
   ingest:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7.0.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 
diff --git a/.github/workflows/instant-sync.yml b/.github/workflows/instant-sync.yml
index 907170cd..60448485 100644
--- a/.github/workflows/instant-sync.yml
+++ b/.github/workflows/instant-sync.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Trigger Propagation
-        uses: peter-evans/repository-dispatch@v4.0.1
+        uses: peter-evans/repository-dispatch@28959ce8df70de7be546dd1250a005dd32156697  # v4.0.1
         with:
           token: ${{ secrets.FARM_DISPATCH_TOKEN }}
           repository: hyperpolymath/.git-private-farm
diff --git a/.github/workflows/jekyll-gh-pages.yml b/.github/workflows/jekyll-gh-pages.yml
index 240037c9..8527176d 100644
--- a/.github/workflows/jekyll-gh-pages.yml
+++ b/.github/workflows/jekyll-gh-pages.yml
@@ -30,11 +30,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
       - name: Setup Pages
-        uses: actions/configure-pages@v6.0.0
+        uses: actions/configure-pages@45bfe0192ca1faeb007ade9deae92b16b8254a0d  # v6.0.0
       - name: Build with Jekyll
-        uses: actions/jekyll-build-pages@v1.0.13
+        uses: actions/jekyll-build-pages@44a6e6beabd48582f863aeeb6cb2151cc1716697  # v1.0.13
         with:
           source: ./
           destination: ./_site
@@ -74,7 +74,7 @@ jobs:
           echo "published tree:"
           find _site -maxdepth 2 | sort
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v5.0.0
+        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9  # v5.0.0
         with:
           # actions/upload-pages-artifact strips dot-entries by default
           # (its tar runs --exclude=.[^/]*), which silently removed
@@ -91,4 +91,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v5.0.1
+        uses: actions/deploy-pages@368f82528645a54fb793d4d04e342629a3f51346  # v5.0.1
diff --git a/.github/workflows/jekyll.yml b/.github/workflows/jekyll.yml
index d1168c7e..df7cb3fe 100644
--- a/.github/workflows/jekyll.yml
+++ b/.github/workflows/jekyll.yml
@@ -35,17 +35,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
       - name: Setup Ruby
         # https://github.com/ruby/setup-ruby/releases/tag/v1.207.0
-        uses: ruby/setup-ruby@v1.321.0
+        uses: ruby/setup-ruby@95ef2b042f9d7a56d8268cba8559e2842e2ad01b  # v1.321.0
         with:
           ruby-version: '3.1' # Not needed with a .ruby-version file
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
           cache-version: 0 # Increment this number if you need to re-download cached gems
       - name: Setup Pages
         id: pages
-        uses: actions/configure-pages@v6.0.0
+        uses: actions/configure-pages@45bfe0192ca1faeb007ade9deae92b16b8254a0d  # v6.0.0
       - name: Build with Jekyll
         # Outputs to the './_site' directory by default
         run: bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
@@ -53,7 +53,7 @@ jobs:
           JEKYLL_ENV: production
       - name: Upload artifact
         # Automatically uploads an artifact from the './_site' directory by default
-        uses: actions/upload-pages-artifact@v5.0.0
+        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9  # v5.0.0
 
   # Deployment job
   deploy:
@@ -65,4 +65,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v5.0.1
+        uses: actions/deploy-pages@368f82528645a54fb793d4d04e342629a3f51346  # v5.0.1
diff --git a/.github/workflows/push-email-notify.yml b/.github/workflows/push-email-notify.yml
index 8d1f0931..521f1e51 100644
--- a/.github/workflows/push-email-notify.yml
+++ b/.github/workflows/push-email-notify.yml
@@ -40,7 +40,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Send push notification email
-        uses: hyperpolymath/smtp-notify-action@v0.3.0 # NOSONAR — pin authority is actions.lock (sha1-ede1191ef6ff3ac02c4f4d9efdf837ee517e11d7)
+        uses: hyperpolymath/smtp-notify-action@22e7bdb322c430c1d0dac6b3bb307f4bb139d0be  # NOSONAR — pin authority is actions.lock (sha1-ede1191ef6ff3ac02c4f4d9efdf837ee517e11d7)
         with:
           server_address: ${{ secrets.SMTP_HOST }}
           server_port: ${{ secrets.SMTP_PORT }}
diff --git a/.github/workflows/quality.yml b/.github/workflows/quality.yml
index c058681d..e949f3d0 100644
--- a/.github/workflows/quality.yml
+++ b/.github/workflows/quality.yml
@@ -22,7 +22,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v7.0.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
       
       - name: Check file permissions
         run: |
@@ -38,7 +38,7 @@ jobs:
           find . -type f -size +1M -not -path "./.git/*" | head -10 || echo "No large files"
       
       - name: EditorConfig check
-        uses: editorconfig-checker/action-editorconfig-checker@v3.0.0
+        uses: editorconfig-checker/action-editorconfig-checker@51f63319f592f97930c73d9c46184d20bd206393  # v3.0.0
         continue-on-error: true
 
   docs:
@@ -46,7 +46,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v7.0.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
       - name: Check documentation
         run: |
           MISSING=""
diff --git a/.github/workflows/rsr-antipattern.yml b/.github/workflows/rsr-antipattern.yml
index 8c71969b..243592c3 100644
--- a/.github/workflows/rsr-antipattern.yml
+++ b/.github/workflows/rsr-antipattern.yml
@@ -23,7 +23,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v7.0.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Check for TypeScript
         run: |
diff --git a/.github/workflows/runtime-policy.yml b/.github/workflows/runtime-policy.yml
index c67f7eb5..2bb51f82 100644
--- a/.github/workflows/runtime-policy.yml
+++ b/.github/workflows/runtime-policy.yml
@@ -38,7 +38,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v7.0.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Report runtime tier and reject mixed toolchains
         run: |
diff --git a/.github/workflows/security-policy.yml b/.github/workflows/security-policy.yml
index 4c1cef16..4ae4ca3b 100644
--- a/.github/workflows/security-policy.yml
+++ b/.github/workflows/security-policy.yml
@@ -21,7 +21,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v7.0.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
       - name: Security checks
         run: |
           FAILED=false
diff --git a/.github/workflows/wellknown-enforcement.yml b/.github/workflows/wellknown-enforcement.yml
index aeefc4c9..9e39f9ca 100644
--- a/.github/workflows/wellknown-enforcement.yml
+++ b/.github/workflows/wellknown-enforcement.yml
@@ -25,7 +25,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v7.0.1
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
       
       - name: RFC 9116 security.txt validation
         run: |
diff --git a/.github/workflows/workflow-linter.yml b/.github/workflows/workflow-linter.yml
index 89090e21..3621b6b4 100644
--- a/.github/workflows/workflow-linter.yml
+++ b/.github/workflows/workflow-linter.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Check SPDX Headers
         run: |
diff --git a/.github/workflows/zig-ffi.yml b/.github/workflows/zig-ffi.yml
index 00b7f13b..3b4341c0 100644
--- a/.github/workflows/zig-ffi.yml
+++ b/.github/workflows/zig-ffi.yml
@@ -37,7 +37,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v7.0.1
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
 
       - name: Install Zig ${{ env.ZIG_VERSION }} (sha256-pinned)
         run: |