perf(ci): cache pnpm verification records on Linux (#23568)

* perf(ci): pilot pnpm verification record caching on Linux

* test(ci): review pnpm verification record in mobile cache audit

.github/workflows/ci-pnpm-verification-pilot.yml

@@ -0,0 +1,65 @@
+name: pnpm verification cache pilot
+
+on:
+  pull_request:
+    paths: ['.github/workflows/ci-pnpm-verification-pilot.yml']
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: pnpm-verification-pilot-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  ORCA_BACKGROUND_LAUNCH: '1'
+
+jobs:
+  seed:
+    strategy:
+      matrix:
+        runner: [ubuntu-latest, ubuntu-24.04-arm]
+    runs-on: ${{ matrix.runner }}
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+      - uses: ./.github/actions/install-node-dependencies
+        id: deps
+      # PR caches are scoped to the PR merge ref; main never restores them.
+      - uses: actions/cache/save@v5
+        if: steps.deps.outputs.verification-cache-hit != 'true'
+        with:
+          path: ${{ steps.deps.outputs.verification-cache-path }}
+          key: ${{ steps.deps.outputs.verification-cache-key }}
+
+  measure:
+    needs: seed
+    name: measure ${{ matrix.runner }} sample ${{ matrix.sample }} cache ${{ matrix.cache }}
+    strategy:
+      fail-fast: false
+      max-parallel: 4
+      matrix:
+        runner: [ubuntu-latest, ubuntu-24.04-arm]
+        sample: [1, 2, 3]
+        cache: ['false', 'true']
+    runs-on: ${{ matrix.runner }}
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+      - uses: ./.github/actions/install-node-dependencies
+        id: deps
+        with:
+          cache-pnpm-verification: ${{ matrix.cache }}
+      - name: Validate treatment and frozen install
+        env:
+          CACHE_ENABLED: ${{ matrix.cache }}
+          CACHE_HIT: ${{ steps.deps.outputs.verification-cache-hit }}
+        run: |
+          if [ "$CACHE_ENABLED" = true ]; then test "$CACHE_HIT" = true; fi
+          git diff --exit-code -- package.json pnpm-lock.yaml pnpm-workspace.yaml
+          node -e "require.resolve('vitest'); require.resolve('electron')"