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-library.json

@@ -0,0 +1,12 @@
+{
+  "library": "unknown",
+  "confidence": 0,
+  "evidence": [],
+  "alternates": [],
+  "signals": {
+    "tailwindLike": 0.136,
+    "radixAttrCount": 0,
+    "classSampleSize": 467
+  },
+  "needsSmart": true
+}