Extract authenticated coulomb.social design language via designlang

Session probe lands on /vw_pages (Research). Use main designlang extract
with --cookie-file — pack ignores auth. 39 artifacts under
docs/design-extract; tolerate designlang late summary crash when cores exist.

docs/design-extract/coulomb-social-intent.json

@@ -0,0 +1,24 @@
+{
+  "pageIntent": {
+    "type": "landing",
+    "confidence": 0.45,
+    "path": "/",
+    "title": "Research | Coulomb",
+    "description": "A tool to brainstorm, discuss, refine implement and promote ideas.\nA social network for building stuff and influencing how stuff is built.\nA marketplace for challenges, methods and solutions.\nA platfo",
+    "signals": [
+      {
+        "kind": "url",
+        "type": "landing",
+        "weight": 0.45,
+        "detail": "root-path"
+      }
+    ],
+    "alternates": [],
+    "needsSmart": true
+  },
+  "sectionRoles": {
+    "sections": [],
+    "counts": {},
+    "readingOrder": []
+  }
+}