chore: prepare isolated workspace for PR 84 blocker regressions

Author: sunnylqm

.github/workflows/hermes-blockers-workspace.yml

@@ -0,0 +1,35 @@
+name: Hermes blockers workspace
+on:
+  push:
+    branches: [codex/hermes-blockers-workspace]
+permissions:
+  contents: read
+jobs:
+  snapshot:
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          ref: 5e1943d7e4c44d1d76fb032ddc5b2ddb951c965b
+          persist-credentials: false
+      - uses: actions/setup-node@v7
+        with:
+          node-version: '24.x'
+      - name: Archive pinned source and real Metro fixtures
+        shell: bash
+        run: |
+          set -euo pipefail
+          root="$RUNNER_TEMP/hermes-blockers"
+          mkdir -p "$root/source" "$root/benchmark" "$root/modern17"
+          git archive HEAD | tar -x -C "$root/source"
+          curl --fail --location --retry 2 https://codeload.github.com/sunnylqm/hbc-diff-benchmark/tar.gz/e6a870a1c26c4b64c7860d7e1aa575707d22ad88 | tar -xz --strip-components=1 -C "$root/benchmark"
+          archive=$(npm pack hermes-compiler@250829098.0.17 --pack-destination "$RUNNER_TEMP" --silent)
+          tar -xzf "$RUNNER_TEMP/$archive" --strip-components=1 -C "$root/modern17" package/package.json package/hermesc/linux64-bin/hermesc
+          tar -czf "$RUNNER_TEMP/hermes-blockers.tgz" -C "$root" .
+      - uses: actions/upload-artifact@v7
+        with:
+          name: hermes-blockers
+          path: ${{ runner.temp }}/hermes-blockers.tgz
+          retention-days: 1
+          if-no-files-found: error