Fix version.json containing invalid JSON (literal newlines in notes)

Use jq to build version.json so multiline release notes are properly
escaped as \n sequences. Also fix current version.json for v1.0.4.

.github/workflows/release.yml

@@ -50,13 +50,12 @@ jobs:
 
       - name: Update version.json
         run: |
-          cat > version.json << JSON
-          {
-            "version": "${{ steps.version.outputs.version }}",
-            "url": "https://github.com/${{ github.repository }}/releases/download/${{ github.ref_name }}/ClaudeChecker.zip",
-            "notes": "$(cat RELEASE_NOTES.md 2>/dev/null || echo 'Release ${{ steps.version.outputs.version }}')"
-          }
-          JSON
+          notes=$(cat RELEASE_NOTES.md 2>/dev/null || echo "Release ${{ steps.version.outputs.version }}")
+          jq -n \
+            --arg version "${{ steps.version.outputs.version }}" \
+            --arg url "https://github.com/${{ github.repository }}/releases/download/${{ github.ref_name }}/ClaudeChecker.zip" \
+            --arg notes "$notes" \
+            '{version: $version, url: $url, notes: $notes}' > version.json
 
       - name: Update Homebrew cask
         run: |