fix(ci): upgrade CI to Node 24 and update lockfile

- Upgrade CI workflow from Node 20 to Node 24 to match the release
  workflow
- Update pnpm-lock.yaml with packageManagerDependencies section that
  pnpm 10.33 writes on Node 24
- Add lockfile integrity check to CI lint job to catch mismatches early

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: wochinge

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
       - uses: pnpm/action-setup@08c4be7e2e672a47d11bd04269e27e5f3e8529cb # v6.0.0
       - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
-          node-version: 20
+          node-version: 24
       - run: pnpm install
       - run: pnpm test:integration
 
@@ -58,7 +58,7 @@ jobs:
       - uses: pnpm/action-setup@08c4be7e2e672a47d11bd04269e27e5f3e8529cb # v6.0.0
       - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
-          node-version: 20
+          node-version: 24
 
       - name: Prepare langfuse server compose
         run: |
@@ -155,9 +155,15 @@ jobs:
       - uses: pnpm/action-setup@08c4be7e2e672a47d11bd04269e27e5f3e8529cb # v6.0.0
       - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
         with:
-          node-version: 20
+          node-version: 24
 
       - run: pnpm install
+      - name: Verify lockfile integrity
+        run: |
+          git diff --exit-code pnpm-lock.yaml || {
+            echo "❌ Error: pnpm-lock.yaml was modified during install"
+            exit 1
+          }
       - run: pnpm build
       - run: pnpm lint
       - run: pnpm format:check

.github/workflows/release.yml

@@ -71,8 +71,6 @@ jobs:
 
       - name: Setup pnpm
         uses: pnpm/action-setup@08c4be7e2e672a47d11bd04269e27e5f3e8529cb # v6.0.0
-        with:
-          standalone: true
 
       - name: Setup Node.js
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6