Observatory update: 434 docs, fix W3C fetcher, regenerate dashboard

- Fixed W3C fetcher to paginate /specifications endpoint (group
  endpoints use type prefixes like cg/, wg/ that weren't in config)
- Fetched 72 new IETF drafts + 1 W3C spec, all analyzed and embedded
- Regenerated dashboard with updated data
- Total: 434 docs, 11 gaps, 1907 ideas

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/data/meta.json

@@ -1,5 +1,5 @@
 {
-  "generated_at": "2026-03-03T23:32:29.056739+00:00",
+  "generated_at": "2026-03-04T00:09:19.610824+00:00",
   "version": "0.3.0",
   "project": "IETF Living Standards Observatory"
 }