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-prompts/cursor.md

@@ -0,0 +1,18 @@
+# Design brief
+Page type: **landing**.
+Material language: **flat**.
+Voice: Tone: neutral · Headings: unknown · CTA verbs: [object Object], [object Object], [object Object], [object Object], [object Object], [object Object].
+## Tokens
+```ts
+export const tokens = {
+  colors: ['#000000', '#efefef', '#616161', '#373737', '#171717', '#ffffff', '#e5e5e5', '#d08728'],
+  fonts: ['[object Object]', '[object Object]', '[object Object]', '[object Object]'],
+  radii: ['4', '8', '12', '15', '20'],
+  shadows: ['rgb(170, 170, 170) 2px 2px 4px 0px', 'rgba(23, 23, 23, 0.1) 2px 2px 8px 2px'],
+};
+```
+## Sections
+- hero
+- features
+- cta
+- footer