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-stack-intel.json

@@ -0,0 +1,12 @@
+{
+  "cms": [
+    "webflow",
+    "bubble"
+  ],
+  "analytics": [],
+  "experimentation": [],
+  "signals": {
+    "scriptCount": 10,
+    "metaCount": 15
+  }
+}