ci: compatibility sweep against public OME-Zarr datasets

.github/workflows/compat-sweep.yml

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+name: Compatibility sweep
+
+# Runs the viewer's dataset checks against public OME-Zarr datasets (see
+# scripts/compat-sweep/sweep.ts) and publishes REPORT.md and results.csv to the
+# compat-sweep branch, one commit per run.
+on:
+  workflow_dispatch:
+    inputs:
+      per_list:
+        description: Datasets sampled per source list
+        default: '15'
+  push:
+    paths:
+      - 'scripts/compat-sweep/**'
+      - '.github/workflows/compat-sweep.yml'
+
+permissions:
+  contents: write
+
+concurrency:
+  group: compat-sweep
+
+jobs:
+  sweep:
+    name: Compatibility sweep
+    runs-on: ubuntu-latest
+    timeout-minutes: 40
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version-file: package.json
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Run sweep
+        run: bun scripts/compat-sweep/sweep.ts --per-list "${{ inputs.per_list || '15' }}" --out sweep-out
+
+      - name: Add report to the job summary
+        run: cat sweep-out/REPORT.md >> "$GITHUB_STEP_SUMMARY"
+
+      - name: Publish to the compat-sweep branch
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          mkdir publish && cd publish
+          git init -q
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git remote add origin "https://x-access-token:${GH_TOKEN}@github.com/${GITHUB_REPOSITORY}.git"
+          if git fetch -q --depth 1 origin compat-sweep; then git checkout -q -b compat-sweep FETCH_HEAD; else git checkout -q --orphan compat-sweep; fi
+          cp ../sweep-out/REPORT.md ../sweep-out/results.csv .
+          git add REPORT.md results.csv
+          git commit -q -m "Sweep of ${GITHUB_REF_NAME}@${GITHUB_SHA::7}"
+          git push -q origin compat-sweep

scripts/compat-sweep/stub-worker.js

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+// Stand-in for the Vite-bundled chunk worker when the compatibility sweep runs
+// Kiln's metadata code under bun: it answers setup messages and never loads bricks.
+export default class StubWorker {
+  onmessage = null;
+  onerror = null;
+
+  postMessage(message) {
+    if (message.type === 'loadBrick' || message.type === 'cancel') return;
+    queueMicrotask(() => this.onmessage?.({ data: { type: message.type, id: message.id } }));
+  }
+
+  terminate() {}
+}