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-motion-tokens.json

@@ -0,0 +1,16 @@
+{
+  "$description": "Motion tokens extracted by designlang",
+  "duration": {
+    "sm": {
+      "$value": "250ms",
+      "$type": "duration",
+      "ms": 250
+    }
+  },
+  "easing": {},
+  "spring": {},
+  "$meta": {
+    "feel": "mixed",
+    "scrollLinked": true
+  }
+}