Speed up daemon smoke checks and keep compiler slots busy (#28106)

* Remove repeated daemon smoke builds and idle compiler slots

* Test compiler scheduling through its process interface

* Keep preview component below the existing line limit with a type-only split

.github/workflows/preflight-critical-path-benchmark.yml

@@ -0,0 +1,42 @@
+name: Preflight critical-path comparison
+on:
+  pull_request:
+    paths:
+      - .github/workflows/preflight-critical-path-benchmark.yml
+      - config/scripts/benchmark-ci-preflight-critical-path.mjs
+  workflow_dispatch:
+permissions:
+  contents: read
+concurrency:
+  group: preflight-critical-path-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+env:
+  ORCA_BACKGROUND_LAUNCH: '1'
+jobs:
+  compare:
+    runs-on: ubuntu-24.04-arm
+    timeout-minutes: 20
+    strategy:
+      fail-fast: false
+      matrix:
+        comparison: [smoke, sync-spawn, typecheck]
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+          fetch-depth: 2
+      - uses: ./.github/actions/install-node-dependencies
+        with:
+          native-runtime: node
+          node-version: '24'
+      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
+        with:
+          bun-version: 1.4.3
+      - name: Compare checks and verify their results
+        run: node config/scripts/benchmark-ci-preflight-critical-path.mjs ${{ matrix.comparison }}
+      - uses: actions/upload-artifact@v7
+        if: always()
+        with:
+          name: preflight-critical-path-${{ matrix.comparison }}
+          path: .build/preflight-benchmark/
+          retention-days: 30