Finish Electron shell and workflow wiring

tests/checks/test_workflow_sample_artifacts.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# Workflow check: generate the offline sample guide and verify the expected
+# outputs exist. This exercises the sample pipeline end to end in a temp root.
+
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+cd "$ROOT_DIR"
+
+TMP_ROOT="$(mktemp -d)"
+trap 'rm -rf "$TMP_ROOT"' EXIT
+
+SAMPLE_ROOT="$TMP_ROOT/sample"
+node scripts/make-sample-guide.js --root "$SAMPLE_ROOT" >/dev/null
+
+for f in sample-manifest.json sample-guide.sfgz; do
+  if [[ ! -s "$SAMPLE_ROOT/$f" ]]; then
+    echo "Missing sample output: $f" >&2
+    exit 1
+  fi
+done
+
+for dir in sample-data sample-exports/json sample-exports/markdown sample-exports/html-simple \
+           sample-exports/html-rich sample-exports/pdf sample-exports/gif \
+           sample-exports/image-bundle sample-exports/docx sample-exports/pptx; do
+  if ! find "$SAMPLE_ROOT/$dir" -type f -print -quit | grep -q .; then
+    echo "Sample export directory is empty: $dir" >&2
+    exit 1
+  fi
+done
+
+MANIFEST_FILE="$SAMPLE_ROOT/sample-manifest.json" node - <<'NODE'
+const fs = require('node:fs');
+const manifest = JSON.parse(fs.readFileSync(process.env.MANIFEST_FILE, 'utf8'));
+if (manifest.format !== 'stepforge-sample-manifest') throw new Error('unexpected sample manifest format');
+if (!manifest.guideId) throw new Error('missing guideId');
+if (!manifest.exports || Object.keys(manifest.exports).length < 9) throw new Error('missing sample exports');
+NODE
+
+echo "sample artifacts OK"