feat(baoyu-url-to-markdown): add HTML snapshot saving and Defuddle fallback pipeline

- Save rendered HTML as sibling -captured.html file alongside markdown
- Defuddle-first conversion with automatic fallback to legacy Readability/selector extractor
- Add rawHtml, conversionMethod, fallbackReason to ConversionResult
- Log converter method and fallback reason in CLI output

skills/baoyu-url-to-markdown/scripts/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "baoyu-url-to-markdown-scripts",
+  "private": true,
+  "type": "module",
+  "dependencies": {
+    "@mozilla/readability": "^0.6.0",
+    "defuddle": "^0.10.0",
+    "jsdom": "^24.1.3",
+    "linkedom": "^0.18.12",
+    "turndown": "^7.2.2",
+    "turndown-plugin-gfm": "^1.0.2"
+  }
+}